Use detector zenith to check for cached value for IceCube-centered atmosphere #46
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In the previous version of the IceCube-centered atmosphere, the upgoing zenith angle >90 degree has been subtracted from 180 to obtain the equivalent zenith at the surface. This value (>90 degrees) has been used to store the previous value. If one requests after a calculation for 0deg, a calculation for 180deg, and then asks again for 0 degree, it will stick to 180 degrees since the last surface zenith is 0 deg in both cases. By storing the last detector zenith instead of the surface zenith, the check for the previous value will correctly detect the change and recalculate the spline.