: Re: preposition for 'point of investigation' We have sampling points where we take water samples from a river. We define them as points of investigation (e.g abb. P1) and use always 'concentrations
It would sound more natural to say 'concentrations at P1'—conditions are generally present at a point, not in it, and with P1 as a specific label, you can then omit the 'a.'
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