### Instruction:

Extract the cause and effect entities from the following sentence:
As the En-Route coverage is the most demanding case with respect to the usage of spectral resources, this case has been investigated in detail—TMA and airport planning have been delegated to the future work

### Assistant:

KEYWORD: As
VARIABLE: this case
CONDITION: has been investigated in detail
NOT_RELEVANT: TMA and airport planning have been delegated to the future work
EFFECT_1: this case has been investigated in detail
CAUSE_1: the En-Route coverage is the most demanding case with respect to the usage of spectral resources

