We should state that CCL is the reference code to convert between A_s and sigma_8. The reference implementation shouldn't necessarily depend on CCL, but it would be good to include a validation function that uses CCL to perform this calculation. If people want to write their own code to do the A_s <-> sigma_8 conversion, it should be validated with respect to the results of the CCL code.
We should state that CCL is the reference code to convert between A_s and sigma_8. The reference implementation shouldn't necessarily depend on CCL, but it would be good to include a validation function that uses CCL to perform this calculation. If people want to write their own code to do the A_s <-> sigma_8 conversion, it should be validated with respect to the results of the CCL code.