LD [n1,n2,n3,n4,n5,n6,n7,n8,n9]
n1: Lookup table to display <all>
n2: Graphic to draw on <n1>
n3: Draw grid on graphic plane <0>
0: draw grid
1: do not draw grid
n4: Preclear graphic plane <0>
0: preclear
1: do not preclear
n5,n6: Plot window offset <1/4 display size>
If n1 is explicitly specified,
then n5,n6 default to n1/8 display size.
n7,n8: Plot window size <1/2 display size>
If n7,n8 are explicitly specified,
then n5,n6 default to 0,0
n9: Labelling: 1: yes, 2: no. <1>
Labelling occurs only if there is
enough room around the plot window
to write the labels.