paint_property [property] [operator] [value] [colour]
Paint according to the residue or atomic property. For example, paint all phenylalanine residues blue and all tryptophanes violet:
paint_prop residue_type = phe blue paint_prop residue_type = trp violet z ; end
Or, colour the first 15 residues red, the remaining yellow:
paint_prop residue_name < A16 red paint_prop residue_name >= A16 yellow z ; end