Calculate a chlorophyll-carotenoid index at in red and green spectra. [Gamon], J. A., Huemmrich, K. F., Wong, C. Y., Ensminger, I., Garrity, S., Hollinger, D. Y., Noormets, A., and Peñuelas, J., A remotely sensed pigment index reveals photosynthetic phenology in evergreen conifers. Proceedings of the National Academy of Sciences, 113(46), 13087-13092, doi.org/10.1073/pnas.1606162113, (2016)

Parameters

l1rec	A level one file
cci	An array into which the result of calculation will be stored