XOFFSET
SET XOFFSET n GET XOFFSET { n }
XOFFSET = 0
XOFFSET is another control on the numbering for the x-axis.
If |XMOD| > 1, then XOFFSET is added to the numbers to be displayed on the x-axis.
|XMOD| > 1
If |XMOD| ≤ 1, then XOFFSET is ignored.
|XMOD| ≤ 1