group giving the variable's name, followed by groups that supply the 
variable's value. the following list shows the header variables and 
their meanings.</pre>
    <pre>although this list is very similar to the list of system variables 
in appendix a of this manual, the two lists are not identical. be 
sure you're referring to the proper list.</pre>
    <pre>note: $axismode and $axisunit are no longer functional in release 
12.</pre>
    <pre>table 11-3. dxf system variables
+===============================================================+
| variable       | type   | description                         |
|----------------|--------|-------------------------------------|
| $acadver       | 1      | the autocad drawing database        |
|                |        | version number; ac1006 = r10,       |
|                |        | ac1009 = r11 and r12                |
|----------------|--------|-------------------------------------|
| $angbase       | 50     | angle 0 direction                   |
|----------------|--------|-------------------------------------|
| $angdir        | 70     | 1 = clockwise angles, 0 =           |
|                |        | counterclockwise                    |
|----------------|--------|-------------------------------------|
| $attdia        | 70     | attribute entry dialogs, 1 = on,    |
|                |        | 0 = off                             |
|----------------|--------|-------------------------------------|
| $attmode       | 70     | attribute visibility: 0 = none,     |
|                |        | 1 = normal, 2 = all                 |
|----------------|--------|-------------------------------------|
| $attreq        | 70     | attribute prompting during insert,  |
|                |        | 1 = on, 0 = off                     |
|----------------|--------|-------------------------------------|
| $aunits        | 70     | units format for angles             |
|----------------|--------|-------------------------------------|
| $auprec        | 70     | units precision for angles          |
|----------------|--------|-------------------------------------|
| $axismode      | 70     | axis on if nonzero (not functional  |
|                |        | in release 12)                      |
|----------------|--------|-------------------------------------|
| $axisunit      | 10, 20 | axis x and y tick spacing           |
|                |        | (not functional in release 12)      |
|----------------|--------|-------------------------------------|
| $blipmode      | 70     | blip mode on if nonzero             |
|----------------|--------|-------------------------------------|
| $cecolor       | 62     | entity color number; 0 = byblock,   |
|                |        | 256 = bylayer                       |
|----------------|--------|-------------------------------------|
| $celtype       | 6      | entity linetype name, or byblock    |
|                |        | or bylayer                          |
|----------------|--------|-------------------------------------|
| $chamfera      | 40     | first chamfer distance              |
|----------------|--------|-------------------------------------|
| $chamferb      | 40     | second chamfer distance             |
|----------------|--------|-------------------------------------|
| $clayer        | 8      | current layer name                  |
|----------------|--------|-------------------------------------|
| $coords        | 70     | 0 = static coordinate display,      |
|                |        | 1 = continuous update, 2 = &quot;d&lt;a&quot;    |
|                |        | format                              |
|----------------|--------|-------------------------------------|
| $dimalt        | 70     | alternate unit dimensioning         |
|                |        | performed if nonzero                |
|----------------|--------|-------------------------------------|
| $dimaltd       | 70     | alternate unit decimal places       |
|----------------|--------|-------------------------------------|
| $dimaltf       | 40     | alternate unit scale factor         |
|----------------|--------|-------------------------------------|
| $dimapost      | 1      | alternate dimensioning suffix       |
|----------------|--------|-------------------------------------|
| $dimaso        | 70     | 1 = create associative dimensioning,|
|                |        | 0 = draw individual entities        |
|----------------|--------|-------------------------------------|
| $dimasz        | 40     | dimensioning arrow size             |
|----------------|--------|-------------------------------------|
| $dimblk        | 2      | arrow block name                    |
|----------------|--------|-------------------------------------|
| $dimblk1       | 1      | first arrow block name              |
|----------------|--------|-------------------------------------|
| $dimblk2       | 1      | second arrow block name             |
|----------------|--------|-------------------------------------|
| $dimcen        | 40     | size of center mark/lines           |
|----------------|--------|-------------------------------------|
| $dimclrd       | 70     | dimension line color, range is      |
|                |        | 0 = byblock, 256 = bylayer          |
|----------------|--------|-------------------------------------|
| $dimclre       | 70     | dimension extension line color,     |
|                |        | range is 0 = byblock, 256 = bylayer |
|----------------|--------|-------------------------------------|
| $dimclrt       | 70     | dimension text color, range is      |
|                |        | 0 = byblock, 256 = bylayer          |
|----------------|--------|-------------------------------------|
| $dimdle        | 40     | dimension line extension            |
|----------------|--------|-------------------------------------|
| $dimdli        | 40     | dimension line increment            |
|----------------|--------|-------------------------------------|
| $dimexe        | 40     | extension line extension            |
|----------------|--------|-------------------------------------|
| $dimexo        | 40     | extension line offset               |
|----------------|--------|-------------------------------------|
| $dimgap        | 40     | dimension line gap                  |
|----------------|--------|-------------------------------------|
| $dimlfac       | 40     | linear measurements scale factor    |
|----------------|--------|-------------------------------------|
| $dimlim        | 70     | dimension limits generated if       |
|                |        | nonzero                             |
|----------------|--------|-------------------------------------|
| $dimpost       | 1      | general dimensioning suffix         |
|----------------|--------|-------------------------------------|
| $dimrnd        | 40     | rounding value for dimension        |
|                |        | distances                           |
|----------------|--------|-------------------------------------|
| $dimsah        | 70     | use separate arrow blocks if nonzero|
|----------------|--------|-------------------------------------|
| $dimscale      | 40     | overall dimensioning scale factor   |
|----------------|--------|-------------------------------------|
| $dimse1        | 70     | first extension line suppressed     |
|                |        | if nonzero                          |
|----------------|--------|-------------------------------------|
| $dimse2        | 70     | second extension line suppressed    |
|                |        | if nonzero                          |
|----------------|--------|-------------------------------------|
| $dimsho        | 70     | 1 = recompute dimensions while      |
|                |        | dragging, 0 = drag original image   |
|----------------|--------|-------------------------------------|
| $dimsoxd       | 70     | suppress outside-extensions         |
|                |        | dimension lines if nonzero          |
|----------------|--------|-------------------------------------|
| $dimstyle      | 2      | dimension style name                |
|----------------|--------|-------------------------------------|
| $dimtad        | 70     | text above dimension line if nonzero|
|----------------|--------|-------------------------------------|
| $dimtfac       | 40     | dimension tolerance display scale   |
|                |        | factor                              |
|----------------|--------|-------------------------------------|
| $dimtih        | 70     | text inside horizontal if nonzero   |
|----------------|--------|-------------------------------------|
| $dimtix        | 70     | force text inside extensions if     |
|                |        | nonzero                             |
|----------------|--------|-------------------------------------|
| $dimtm         | 40     | minus tolerance                     |
|----------------|--------|-------------------------------------|
| $dimtofl       | 70     | if text outside extensions, force   |
|                |        | line extensions between extensions  |
|                |        | if nonzero                          |
|----------------|--------|-------------------------------------|
| $dimtoh        | 70     | text outside horizontal if nonzero  |
|----------------|--------|-------------------------------------|
| $dimtol        | 70     | dimension tolerances generated if   |
|                |        | nonzero                             |
|----------------|--------|-------------------------------------|
| $dimtp         | 40     | plus tolerance                      |
|----------------|--------|-------------------------------------|
| $dimtsz        | 40     | dimensioning tick size: 0 = no ticks|
|----------------|--------|-------------------------------------|
| $dimtvp        | 40     | text vertical position              |
|----------------|--------|-------------------------------------|
| $dimtxt        | 40     | dimensioning text height            |
|----------------|--------|-------------------------------------|
| $dimzin        | 70     | zero suppression for &quot;feet &amp; inch&quot;  |
|                |        | dimensions                          |
|----------------|--------|-------------------------------------|
| $dwgcodepage   | 70     | drawing code page. set to the       |
|                |        | system code page when a new drawing |
|                |        | is created, but not otherwise       |
|                |        | maintained by autocad               |
|----------------|--------|-------------------------------------|
| $dragmode      | 70     | 0 = off, 1 = on, 2 = auto           |
|----------------|--------|-------------------------------------|
| $elevation     | 40     | current elevation set by elev       |
|                |        | command                             |
|----------------|--------|-------------------------------------|
| $extmax        | 10, 20,| x, y, and z drawing extents         |
|                | 30     | upper-right corner (in wcs)         |
|----------------|--------|-------------------------------------|
| $extmin        | 10, 20,| x, y, and z drawing extents         |
|                | 30     | lower-left corner (in wcs)          |
|----------------|--------|-------------------------------------|
| $filletrad     | 40     | fillet radius                       |
|----------------|--------|-------------------------------------|
| $fillmode      | 70     | fill mode on if nonzero             |
|----------------|--------|-------------------------------------|
| $handling      | 70     | handles enabled if nonzero          |
|----------------|--------|-------------------------------------|
| $handseed      | 5      | next available handle               |
|----------------|--------|-------------------------------------|
| $insbase       | 10, 20,| insertion base set by base command  |
|                | 30     | (in wcs)                            |
|----------------|--------|-------------------------------------|
| $limcheck      | 70     | nonzero if limits checking is on    |
|----------------|--------|-------------------------------------|
| $limmax        | 10, 20 | xy drawing limits upper-right       |
|                |        | corner (in wcs)                     |
|----------------|--------|-------------------------------------|
| $limmin        | 10, 20 | xy drawing limits lower-left        |
|                |        | corner (in wcs)                     |
|----------------|--------|-------------------------------------|
| $ltscale       | 40     | global linetype scale               |
|----------------|--------|-------------------------------------|
| $lunits        | 70     | units format for coordinates and    |
|                |        | distances                           |
|----------------|--------|-------------------------------------|
| $luprec        | 70     | units precision for coordinates     |
|                |        | and distances                       |
|----------------|--------|-------------------------------------|
| $maxactvp      | 70     | sets maximum number of viewports to |
|                |        | be regenerated                      |
|----------------|--------|-------------------------------------|
| $menu          | 1      | name of menu file                   |
|----------------|--------|-------------------------------------|
| $mirrtext      | 70     | mirror text if nonzero              |
|----------------|--------|-------------------------------------|
| $orthomode     | 70     | ortho mode on if nonzero            |
|----------------|--------|-------------------------------------|
| $osmode        | 70     | running object snap modes           |
|----------------|--------|-------------------------------------|
| $pdmode        | 70     | point display mode                  |
|----------------|--------|-------------------------------------|
| $pdsize        | 40     | point display size                  |
|----------------|--------|-------------------------------------|