The two may not be the same:
The most frequent field can be XXXX associated to PHYS, but the most frequent main field, taking into account all other sources can be, e.g. MATE
The selection of matches should better be done on the second, rather than the first (or on both).
The two may not be the same: The most frequent field can be XXXX associated to PHYS, but the most frequent main field, taking into account all other sources can be, e.g. MATE The selection of matches should better be done on the second, rather than the first (or on both).