This attribute controls the appearance of an annotated
coordinate grid (drawn with the astGridastGrid function) by determining
the density of minor tick marks which appear between the major
axis values of a PlotPlot. It takes a separate value for each
physical axis of a Plot so that, for instance, the setting
"MinTick(2)=2" specifies the density of minor tick marks along
the second axis.
The value supplied should be the number of minor divisions
required between each pair of major axis values, this being one
more than the number of minor tick marks to be drawn. By
default, a value is chosen that depends on the gap between major
axis values and the nature of the axis.