### Instruction:

Extract the cause and effect entities from the following sentence:
When the result of this ‘double-differencing test’, which was first implemented by [RD-67], is close to zero, then the atmospheric profiles can be assumed to be representative of the real conditions

### Assistant:

KEYWORD: then
VARIABLE: the atmospheric profiles
NOT_RELEVANT: which was first implemented by [RD-67]
CONDITION: can be assumed to be representative of the real conditions
EFFECT_1: the atmospheric profiles can be assumed to be representative of the real conditions
CAUSE_1: is close to zero

