The detection wavelength for the R-TL MAR protocol from the fine-grained quartz fraction was restricted by Oriel D630/
60 þ D620/75 filters with transmission from 570 to 685 nm (maximum from 600 to 660 nm; based on manufacturer’s data) in a Daybreak 1150 TL reader. No preheat was applied as test measurements showed no overlap of low temperature peaks to the TL > 260 C and the obtained heating plateau (after Aitken, 1985) ranges from 260 to 320 C. Three regeneration doses of 42, 84 and 126 Gy with 3 aliquots each were analysed with a linear fit, on which the natural TL of 17 aliquots was interpolated (Figure S3), using the TLAPPLIC 4.30 software. An attempt with MAAD R-TL failed due to insufficient reproducibility of the few aliquots available.