Additional Notes

• Some commands take a long time to run the first time they are invoked (particularly view), but respond much more quickly after that.
• delmod currently can only be applied to the last model.
• The error command automates the process of searching for via stepping the parameters. It first tries to estimate the range of the parameter with a binary search of the parameter space (using the initial ``delta'' value of the parameter as a guide) and then steps the parameter through the range. If error all is requested, this processes is automatically repeated for all free parameters, and the fitting and error search are restarted if a new relative minimum is found. The parameter delta values are continuously updated so that when a new minimum is found, the previous error range found for each parameter is the starting point for deriving the revised errors.
• The shell script autoximg (see below) is useful for automating an error search as a background process.