raw data ... what is raw, and what is data?
My area of interest is photography.
The sensor in a camera gets photons, and something happens because of that, which produces voltages, which are recorded.
In order to produce a picture - what people actually want from a camera in the end - those voltages have to be processed into something to keep. Raw camera files are big - and less raw than the direct effects on the sensor, fairly direct though they are. The camera processes them into a JPEG image.
If you retain the raw file (often given as RAW, for no reason clear to me) you can repeat that processing, and you can do darkroom tricks on it. (In film days or terms the undeveloped negative is the raw data, but you can't even read it until you process it, which requires decisions which influence the picture produced. Operator effort and skill is involved)
Reuters was recently reported to have required photographers no longer to record raw files, in search of unedited unaltered images from wherever they are being taken.
SImilarly, I suspect there is rather a lot of raw data off those big magnetic whirry 3-D cameras and even though storage is cheaper, keeping it forever or even long enough to get it off the box is not entirely likely.
Bottom Line: only select Open Source software for medicine and science if you want to make it difficult to be prevented from detecting faults.