Inverting Picks to Data in Diffract

The Model from Picks button in the Model Window is only active if fits to observations have been made from the Fit Window. When chosen, the line fits made to individual diffractors are used to determine the depth of the diffractor and the velocity of the material that the diffractor is in. A new column is added to the diffractor list with the local velocity of the medium in which the diffractor is present. If the calculated value is more than 10% different from the starting value, the user is notified with an alert and should consider changing the velocity of the structure to match that presented. The depths are calculated assume the velocity suggested by the diffractor, not that presently in use from the velocity structure.