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10.6 Non-Geometric Aperture Beam Size Scaling

Caveat: If observations are performed in non-standard apertures (see Section 5.4), deviations from the correct flux calibration can occur. Especially extended source observations with P1 and P2 using the largest apertures are expected to exhibit the largest deviations (see Section 4.5.1). This caveat often applies to background observations which are required to determine the source flux.

ISO Handbook Volume IV (PHT), Version 2.0.1, SAI/1999-069/Dc