Frequency responses for AVHRR/3 (NOAA15–NOAA19).
Only channels 3B, 4 and 5 are included.
Extracted from NOAA KLM User's Guide Appendix D with get_avhrr_srf.py.

Sensor los calculated based on information in NOAA KLM User's Guide
Appendix J.1. with get_sensor_los.py