to call the read_data procedure with specific parameters, for example in example below, the reader for
Zygo cannot be called directly with intensity keyword set to True without making a specific case from the other readers,
while this can be done using read_data.</p>
<p>this is an ugly way to deal with the fact that return
arguments are different if header is set, so when assigned to a variable as in patch routines in pySurf instrumentReader it fails.
Workaround has been calling directly read_data, not opti