I am trying to correct some Landsat 8 OLI imagery using the Orfeo Toolbox Optical Calibration tool via QGIS. I've retrieved data from Aeronet as well as relative spectral response data for the OLI sensor from here. However, I can't seem to get the tool to run. I'm having difficulty finding any documentation beyond that I need the RSR file and the Aeronet file. What I'm unsure of is A: what format the relative spectral response data needs to be in, and B: what file counts as the Aeronet file? Aeronet gives me several datasets to choose from here. Alternatively, if anyone has any suggestions for alternative methods or tools, I'll gladly hear them.