YLOGBASE

Syntax: SET YLOGBASE n
GET YLOGBASE { n }
Default: YLOGBASE = 0

YLOGBASE determines whether the y-axis is to be linear or logarithmic.
YLOGBASE should always be > 0.

YLOGBASE meaning
> 1.0 the y-axis will have a logarithmic scale. The base will be the integer part of YLOGBASE, except for the special case: 1.05*e > YLOGBASE > 0.95*e, where e is the base of the natural logarithms, e ≈ 2.718281828, in which case the base will be e.
≤ 1.0 the y-axis will have a linear scale

If YLOGBASE > 1.0, then YMIN and YMAX are assumed to be the exponents for the minimum and maximum values on the y-axis. The maximum value displayed on the y-axis is YLOGBASEYMAX and the minimum value displayed on the y-axis is YLOGBASEYMIN. Integer exponents are always used for the axis numbering, so the y-axis may not begin and/or end on a large tic mark.

If YLOGBASE = 10.0, the small tic marks on the y-axis can be specified exactly with YNSINCS. If small tic marks are desired at the locations j*10n, where 2 ≤ j ≤ 9, then set YNSINCS = -j. For example, if you want small tic marks at 2*10n, 4*10n, 5*10n, and 8*10n, then set SET YNSINCS -2458.

If YLOGBASE ≤ 1.0, YMIN and YMAX are the actual minimum and maximum values for the y-axis; and the y-axis always begins and ends on large tic marks.