"specifies that numerical labels should be drawn for the second axis.
If the NumLab value of a Plot axis is non-zero (the default), then numerical labels will be drawn for that axis, otherwise they will be omitted.
The drawing of associated descriptive axis labels for a Plot (describing the quantity being plotted along each axis) is controlled by the TextLab(axis) attribute.
If no axis is specified, (e.g.
" instead of
" ), then a
" operation will affect the attribute value of all the Plot
axes, while a
" operation will use just the NumLab(1) value.