This function is similar to the TestIX function, but instead of the flag
array, calibIX retrieves the index of the computed quantity. The array to which
the index can be applied is CALIB(). Its main purpose is to allow
looping in user routines when repetitive operations have to be done on
consecutive computed quantities.
F The function name has to be declared as INTEGER*4 parameter.
index = calibIX (computed_quantity_name)