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The gas optics models distributed as part of ecRad are here, and include "reference" models in the longwave and shortwave with 64 k terms.
For computing UV index, higher spectral resolution is needed in the relevant spectral region, for which there are two shortwave files that can be used:
- Shortwave 64-term model with around 5-nm resolution in the 295-330 nm range: ecckd-1.2_sw_climate_window-64b_ckd-definition.nc
- Shortwave 96-term model with around 5-nm resolution in the 280-380 nm range: ecckd-1.4_sw_climate_vfine-96b_ckd-definition.nc