# DIMCEN System Variable
[GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md)
**Function Description:**
The DIMCEN system variable is used to control how to draw center marks and center lines for circles or arcs by DIMCENTER, DIMDIAMETER, and DIMRADIUS commands.
| | |
| --- | --- |
| Type | Real |
| Saved in | Drawing |
| Initial value | 0.0900(Imperial) or 2.5000 (Metric) |
According to DIMDIAMETER and DIMRADIUS commands, it creates center marks when the extension lines placed outside of circles and arcs.
**System Variable Value:**
**0:** do not create center marks and center lines
**<0:** create center lines
**>0:** create center marks
The absolute value of DIMCEN system variable specifies the size of center marks or center lines.
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[Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables/DIMCEN.html) · © Gstarsoft Co., Ltd.