Fig. 8
Example of how CAAPR extrapolates aperture noise, for SPIRE 250 μm photometry of M 101 (NGC 5457). Blue circles indicate aperture noise determined when using mini-apertures of different sizes. Note that the error bars do not represent uncertainties, but rather indicate weightings assigned to each point, with greater weight given to mini-apertures closer in size to the master aperture. Blue dashed line indicates best-fit power law to trend exhibited by these points. Red hexagon indicates extrapolated aperture noise for M 101, given area of its master aperture.
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