There is a program (that can be obtained by ftp) called 'plot.a/dot'
which does what you want (I think). It can be used together with the
editor 'aa.data' - they are both part of a package of protein analysis
programs (10 different or so). However, it is for Mac so it will
perhaps be of no use to you?
O==O ================================== O==O
O==O Peter Lundberg O==O
O==O Email: peterl at umdix.umdc.umu.se O==O
O==O ============761.91141============= O==O