I've tested LibRaw-0.19.5/bin/dcraw_emu.exe on some FujiFilm RAW files without any command line options.
I've obtained unexpected output for XF10 model. With the command:
the generated .ppm output had resolution only 1470x40 pixels.
However, e.g. for X-A3 model:
the generated .ppm output had resolution 6016x4014 pixels.