ASCII data is typically a text file with two columns. The first column is the wavelength (measured in nanometers) and the second column is the corresponding transmission value of the filter at that wavelength. The transmission value is either on a scale of 0 to 1 or of 0% to 100%. ASCII data is available to download for all filters on the Semrock website. Most filters show actual measured data, while a few filters have theoretical data listed. The legend indicates that the displayed data is either measured or theoretical.
When you are viewing a filter's details you will find a link to the ASCII data for that filter to the right of the graph. Click on ASCII Data to save a copy of the text file that can be used to graph the filter's spectra.
If you need theory data on a single filter, use the blue MyLight butto found above the graph and model your theory data, as well as download your ASCII data.