# DIMCEN System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [D](Help%20System/GSTARCAD/2026/System%20Variables/D/(D).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. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Dgsv/DIMCEN.html) · © Gstarsoft Co., Ltd.