### Instruction:

Extract the cause and effect entities from the following sentence:
When the RPPKE between spectral channels with differing spatial sampling distance is A group of p2 of the finer resolution spectral channel pixels centred on a coarse resolution pixel is taken as a pixel group

### Assistant:

KEYWORD: When
VARIABLE: pixels centred on a coarse resolution pixel
CONDITION: is taken as a pixel group
CAUSE_1: the RPPKE between spectral channels with differing spatial sampling distance is A group of p2 of the finer resolution spectral channel
EFFECT_1: pixels centred on a coarse resolution pixel is taken as a pixel group

