### Instruction:

Extract the cause and effect entities from the following sentence:
As required navigation performance (RNP)/RNAV capabilities increase, the low-altitude airspace structure remains largely unchanged

### Assistant:

KEYWORD: As
VARIABLE: the low-altitude airspace structure
CONDITION: remains largely unchanged
EFFECT_1: the low-altitude airspace structure remains largely unchanged
CAUSE_1: required navigation performance (RNP)/RNAV capabilities increase

