There is software around which will allow you to define different nugget effects in different directions, but I would not put any bets on the outcome!
It looks like you have a short range component which cannot be seen because of the spacing of your data. Try adding a spherical component with a shorter range and a component sill of the right size to make the nugget effect equal in all directions. I would. Isobel Clark http://geoecosse.bizland.com __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org