The flux and its uncertainty at a specified offset position.

Definition:

This is a built-in group datatype, defined as:

  group TrialPosition {
    Double offset,           # The trial offset position.
    Double flux,             # The average flux at the above position.
    Double sdev              # The uncertainty in the above flux.
  }

The offset member holds the offset position at which the trial was done. The flux and sdev members should be assigned the corresponding return values of the requested_flux() function at that offset position.

For an example of how this is used, please see the help page for the fit_pointing() function.