15

DXF version to write ?
[12] -> AutoCAD_R13
[14] -> AutoCAD_R14
[15] -> AutoCAD_2000_2002 (default)
[18] -> AutoCAD_2004_2006
[21] -> AutoCAD_2007_2009
[24] -> AutoCAD_2010_2012
[27] -> AutoCAD_2012_2017
[32] -> AutoCAD_2018_2022

integer