@ Devon and Viktor The dr I use was not a mistake. Experimenting with dr pointed me in this direction for obtaining a square picture. I also tried other values for prime 11 and concluded it being a good (the best?) choice for a pretty nebula-like picure.
I also tried some x |. dr . That showed me that my original dr produces the nicest picture (i.e for me). -- Met vriendelijke groet, =@@i ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
