Hi Lisa,
I presume that what you have here is a phase difference map. This is quite common, e.g. with the Siemens field mapping sequence. This means that the difference has already been calculated at the scanner and does not need to be done by the FieldMap toolbox. In this case, you can ignore the second "load phase" and "load magnitude" buttons.
An alternative is to use the batch functionality where there is a specific entry for "pre-subtracted phase and magnitude data".
Hope that helps,
Martina
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