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it's a real problem. You might try to expose red at lower angles above the horizon, followed by green and then blue when high up - the seeing varies with altitude and wavelength and this approach can help get similar PSFs in the three channels. Otherwise, it is possible to adjust colours using a combination of deconvolution to tighten up channels or, if all else fails, blurring will bring tighter channels back to the norm.
Or, you could just shrug and say that that is what the data is like - and accept a bit of colour edging.
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