### Instruction:

Extract the cause and effect entities from the following sentence:
The requirement can only be fulfilled if the extragalactic sky is covered at high galactic latitudes with b≥30 deg

### Assistant:

VARIABLE: the extragalactic sky
CONDITION: be fulfilled
EFFECT_1: be fulfilled
KEYWORD: only
CAUSE_1: the extragalactic sky is covered at high galactic latitudes with b≥30 deg

