 All files supplied are  ( C Copyright N. R. Arnot, 1987 and 1992.   * THe following conditions must be observed:  L This code as supplied 'as is'. The Author takes no responsibility whatsoever) for any consequences arising from its use   G This code may not be sold for profit, nor may any derivative thereof be O sold for profit. (Should you wish to do so, please make an offer to the author, E who might be persuaded to grant you a license to do so). 'Derivative' @ excludes files created as a direct result of running the programG in the usual way (in other words I'm not trying to claim rights to your  shareable images).    K The copyright notices contained in these files may not be altered, deleted,  or amended in any way.    J With these  exceptions, you are free to use this code in any way you like.J The Author would like to hear of any changes or improvements that you findG useful. You are free to distribute it, provided that no charge is made.   