14DM-1-GTI1-5-400 25.4 mm Dia. UVFS Gires-Tournois Interferometer Mirror; t=5mm Dielectric 790-810nm | Optics | Mirror | Dielectric Mirror | Standa | UVFS | Circular |
14DM-05-HR5-0-2 12.7 mm Dia. UVFS HR Laser Line Mirror; t=5mm Dielectric 515nm | Optics | Mirror | Dielectric Mirror | Standa | UVFS | Circular |
14DM-1-DHR9-0-2 25.4 mm Dia. UVFS Dual Laser Line Reflecting Mirror; t=5mm Dielectric 532/1064nm | Optics | Mirror | Dielectric Mirror | Standa | UVFS | Circular |
14DM-05-GTI2-5-200 12.7 mm Dia. UVFS Gires-Tournois Interferometer Mirror; t=5mm Dielectric 1010-1050nm | Optics | Mirror | Dielectric Mirror | Standa | UVFS | Circular |
14DM-05-GTI2-5-600 12.7 mm Dia. UVFS Gires-Tournois Interferometer Mirror; t=5mm Dielectric 1015-1045nm | Optics | Mirror | Dielectric Mirror | Standa | UVFS | Circular |
14DM-1-BBHR3-0-1 25.4 mm Dia. N-BK7 HR BroadBand Mirror; t=6mm Dielectric 760-840nm | Optics | Mirror | Dielectric Mirror | Standa | N-BK7 | Circular |
14SM-1 25.4 mm Dia. UVFS Flat Metallic Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Metallic Mirror | Standa | UVFS | Circular |
14SM-2 50.8mm Dia. UVFS Flat Metallic Mirror; t=8mm Protected Silver 550nm | Optics | Mirror | Metallic Mirror | Standa | UVFS | Circular |
14AM-05 12.7 mm Dia. UVFS Flat Metallic Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Metallic Mirror | Standa | UVFS | Circular |
14AM-1-50 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14AM-1-100 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14SM-1-50 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14GM-1-100 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Gold 750nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14EAM-1-100 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm UV Enhanced Aluminum 250-600nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14GM-1-500 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Gold 750nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14SM-1-100 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14SM-1-1000 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14GM-1-200 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Gold 750nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14EAM-1-1000 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm UV Enhanced Aluminum 250-600nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14OAP-1-381-15-AL 25.4 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=387.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-635-15-AL 25.4 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=654.99mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-508-15-AL 50.8 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=516.81mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-635-15-AL 76.2 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=646mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-381-15-AL 101.6 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=387.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-25.4-30-AL 25.4 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=27.22mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-30-AL 25.4 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=54.45mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-50.8-30-AL 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=54.45mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-101.6-30-AL 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=108.89mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-254-30-AL 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=272.24mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-30-AL 76.2 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=81.67mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-254-30-AL 76.2 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=272.23mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-304.8-30-AL 101.6 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=326.69mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-127-45-AL 25.4 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=148.79mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-50.8-45-AL 50.8 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=59.51mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-101.6-45-AL 50.8 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=119.03mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-127-45-AL 76.2 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=148.79mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-152.4-45-AL 76.2 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=178.53mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-152.4-45-AL 101.6 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=178.55mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-76.2-60-AL 50.8 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-12.7-90-AL 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=25.4mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-25.4-90-AL 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-25.4-90-AL 76.2 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-90-AL 76.2 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-88.9-90-AL 76.2 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=177.8mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-381-15-GM 25.4 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=387.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-635-15-GM 25.4 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=654.99mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-304.8-15-GM 50.8 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=310.08mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-508-15-GM 50.8 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=516.81mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-381-15-GM 101.6 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=387.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-508-15-GM 101.6 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=516.81mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-30-GM 25.4 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=54.45mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-127-30-GM 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=136.12mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-254-30-GM 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=272.24mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-254-30-GM 76.2 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=272.23mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-304.8-30-GM 101.6 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=326.69mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-101.6-45-GM 25.4 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=119.02mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-50.8-45-GM 50.8 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=59.51mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-152.4-45-GM 76.2 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=178.53mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-101.6-45-GM 101.6 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=119.03mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-152.4-45-GM 101.6 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=178.55mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-60-GM 25.4 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=67.74mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-76.2-60-GM 50.8 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-60-GM 76.2 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-25.4-90-GM 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-90-GM 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-25.4-90-GM 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-95.3-90-GM 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=190.5mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-90-GM 76.2 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-50.8-90-GM 101.6 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-76.2-90-GM 101.6 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Gold | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14AM-1-1000 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14SM-1-200 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14SM-1-500 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Silver 550nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14EAM-1-200 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm UV Enhanced Aluminum 250-600nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14EAM-1-500 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm UV Enhanced Aluminum 250-600nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14AM-1-200 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14GM-1-1000 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Gold 750nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14EAM-1-50 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm UV Enhanced Aluminum 250-600nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14AM-1-500 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Aluminum 400nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14GM-1-50 25.4 mm Dia. UVFS Plano-Concave Mirror; t=6mm Protected Gold 750nm | Optics | Mirror | Curved Mirror (Concave) | Standa | UVFS | Circular |
14OAP-2-304.8-15-AL 50.8 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=310.08mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-508-15-AL 101.6 mm Dia. Aluminum 15° Off-Axis Parabolic Mirror; EFL=516.81mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-127-30-AL 50.8 mm Dia. Aluminum 30° Off-Axis Parabolic Mirror; EFL=136.12mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-101.6-45-AL 25.4 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=119.02mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-45-AL 76.2 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=89.28mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-101.6-45-AL 101.6 mm Dia. Aluminum 45° Off-Axis Parabolic Mirror; EFL=119.03mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-25.4-60-AL 25.4 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=33.85mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-38.1-60-AL 25.4 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-60-AL 25.4 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=67.74mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-76.2-60-AL 76.2 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-114.3-60-AL 76.2 mm Dia. Aluminum 60° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-25.4-90-AL 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=50.8mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-50.8-90-AL 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-76.2-90-AL 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-1-101.6-90-AL 25.4 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=203.2mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-50.8-90-AL 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-76.2-90-AL 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=152.4mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-2-95.3-90-AL 50.8 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=190.5mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-3-50.8-90-AL 76.2 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |
14OAP-4-50.8-90-AL 101.6 mm Dia. Aluminum 90° Off-Axis Parabolic Mirror; EFL=101.6mm Protected Aluminum | Optics | Mirror | Off-Axis Parabolic Mirror | Standa | N-BK7 | Circular |