# DIMCEN System Variable [GstarCAD 2020](Help%20System/GSTARCAD/2020/Index.md) → [System Variables](Help%20System/GSTARCAD/2020/System%20Variables/(System%20Variables).md) → [D](Help%20System/GSTARCAD/2020/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. --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md) · [GstarCAD 2017](../../../2017/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md) · [GstarCAD 2018](../../../2018/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md) · [GstarCAD 2019](../../../2019/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md) · [GstarCAD 2021](../../../2021/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/D/DIMCEN%20System%20Variable--fdfd7fe999ad.md)