Loads the colour table for the currently open graphics device KPG1_LTLOD
"
kappa.lut.sdf"
and contains a LUT for different devices. The
file should have been created by KPG1_LTSAV. If the file does not exist, the colour table is set to a
greyscale.
Each lut in the file is a _REAL array of shape (3,n) where n is the number of colours in the lut.
Each array has a name which identifies the graphics device to which it refers.
A graphics device must previously have been opened using PGPLOT.