A tapered rectangular aperture.
Parallel capable? : yes
GPU capable? : no
Back-tracking capable? : no
| Parameter Name | Units | Type | Default | Description |
| L | M | double | 0.0 | length |
| XSTART | M | double | 0.0 | horizontal half-aperture at the start |
| XEND | M | double | 0.0 | horizontal half-aperture at the end |
| YSTART | M | double | 0.0 | vertical half-aperture at the start |
| YEND | M | double | 0.0 | vertical half-aperture at the end |
| DX | M | double | 0.0 | misalignment |
| DY | M | double | 0.0 | misalignment |
| TILT | RAD | double | 0.0 | misalignment |
| STICKY | NULL | short | 0 | final aperture holds downstream until next TAPERAPC, TAPERAPE, TAPERAPR, or MAXAMP |
| GROUP | string | NULL | Optionally used to assign an element to a group, with a user-defined name. Group names will appear in the parameter output file in the column ElementGroup |
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TFBDRIVER