Fig. 1.
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Smear polarisability boost factor, 
as a function of Sérsic n for a galaxy with an effective radius of 
. The Gaussian PSF has a FWHM of 
and the Airy PSF is our Euclid-like PSF (see Sect. 3). The shaded regions indicate the variation in 
when the PSF size is varied by ±10%. The sensitivity to the PSF size is negligible for 
in this case, whereas 
for the Gaussian PSF.
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