>>17265
>>17267
it seems if you replace the file extension (but NOT the &sfrm=jpg, it must be kept as is) with .png you get a better copy
haven't found a way to get a better copy than png 2000-height. it gives something called ".jxr" that is higher file size but looks the same as png

in any case, will update nat archive with the best copies i can fiddle out of it later