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Both case may find 'hint' on order, type of data and scale in begining of file like:
! Frequency S11 S21 S12 S22
# HZ S DB R 50
or cartetisian (rectangular) note:
VAR FREQ MAG 801
DATA S[1,1] RI
DATA S[2,1] RI
DATA S[1,2] RI
DATA S[2,2] RI
SEG 70000000 120000000 801
examples above taken from NVA hp8753
but different intrument manufacture and software can use different format and scale (db, SWR, rad, degree etc.) so read spec and textfile carefully and many programs import filter can read this hint and use data on right way in most cases.
remember - all vaue handle power flow in different way between S-port in normalized form, not voltage, not ampere, so you must know system impedances and scale factor etc. to recalculate to component value etc.