Source: cli/stream/form_indices.pro
form_indices Calculate a spectral index from streams of the current dataset and add them as new streams. Usage: form_indices, index1, index2 or: form_indices, index Arguments: index1 int input The stream index (or a 1-d array of indices) of the "numerator" streams. index2 int input The stream index (or a 1-d array of indices) of the "denominator" streams. index int input A 2xN array of pairs of stream indices. Datasets: RATE History: Original: 30/8/00; SJT