--- Start of Idrisi List message It appears that plane does indeed work. I had not oriignally tried it but could find no reference to it in the help or manuals and it is not in the drop down menu under XYZIDRISI. I did type it in and that is all it needed. Simple but I was looking for the choice in the menu not knowing to over ride it with typing PLANE. Thanks to all who did respond, all with the same answer, --- End of Idrisi List message IDRISI-L is an unmoderated list. As a service to list users, please post a summary of useful responses to your questions. To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To subscribe to the list, send an email from the address to be subscribed to [EMAIL PROTECTED] with "subscribe" (without quotes) as the first line of the message body. To unsubscribe, do the same, only with "unsubscribe" as the first line of the message body.