For each axis, the LabelAt value gives the value on the other axis at which numerical labels and tick marks should be placed. For example, in a celestial (right ascension, declination) co-ordinate system, LabelAt(1) gives a declination value that defines a line (of constant declination) along which the numerical right-ascension labels and their associated tick marks will be drawn. Similarly, LabelAt(2) gives the right-ascension value at which the declination labels and ticks will be drawn.
The default bahaviour is for the application to generate its own position for numerical labels and tick marks.
KAPPA --- Kernel Application Package