
| ASCII | 'Y' |
| Hexadecimal | 0x59 |
| Decimal | 89 |
Point start, Point end, Float radius, Byte endcap_visibilities
| start | beginning of cylinder axis |
| end | end of line cylinder axis |
| radius | radius of the cylinder |
| endcap visibilities | flags to indicate the visibility of the two endcaps |
| 0x01 | Disc centered at the cylinder start point is visible. |
| 0x02 | Disc centered at the cylinder end point is visible. |
Cylinder is inserted into the currently opened segment.
Cylinder support was added in HSF format 6.50.