### Instruction:

Extract the cause and effect entities from the following sentence:
On performing a Fourier transform of the interferogram each spectral sounding has the same number of spectral samples

### Assistant:

VARIABLE: each spectral sounding
CONDITION: has the same number of spectral samples
KEYWORD: On
CAUSE_1: performing a Fourier transform of the interferogram
EFFECT_1: each spectral sounding has the same number of spectral samples


### END
