Hello Ted, In your latest reply, you told to use param statment defining unitlength and use it with WIDTH and HEIGHT. Is the value 2.5e-6 a preferred one in my case, or it was just an example? I am sorry to say, but I have mistakenly deleted the mail you sent telling me to specify the NH along with NW. In case you have the group copy of that mail, please, forward it to me. Thank you. Jayanta ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu