Locate your camconst.json file and insert this
{ // Quality B
"make_model": "NIKON COOLPIX P950",
"dcraw_matrix" : [13307, -5641, -1290, -2048, 10581, 1689, -64, 1222, 5175], // copied from ART
"ranges": {
"black": 200
}
},
Gives this
