This attribute controls the appearance of an annotated
coordinate grid (drawn with the astGridastGrid function) by determining
whether textual labels should be drawn to describe the quantity
being represented on each axis of a PlotPlot. It takes a separate
value for each physical axis of a Plot so that, for instance,
the setting "TextLab(2)=1" specifies that descriptive labels
should be drawn for the second axis.
If the TextLab value of a Plot axis is non-zero, then
descriptive labels will be drawn for that axis, otherwise they
will be omitted. The default behaviour is to draw descriptive
labels if tick marks and numerical labels are being drawn around
the edges of the plotting area (see the LabellingLabelling attribute),
but to omit them otherwise.