Extended Data Fig. 4: The finding that glacial ∆13CH2D data are more variable than Holocene data from the same latitude band is insensitive to how latitudes are grouped.
From: Isotopic evidence for elevated photorespiration during the last glacial period
a Kernel density estimates (KDEs) of Holocene (pink) and glacial (blue) ∆13CH2D data grouped latitude in 10° ranges. This is the same grouping as in Fig. 4b in the Main text, except here 10–20 and 20–30°N groups are separated. Asterisk denotes group where glacial ∆13CH2D data are significantly more variable than Holocene data (P < 0.05 in two-sided Levene test for equal variances). b same as a) except using 15° ranges. c same as a) except using 20° ranges, beginning at 10°N because we have no data below 10°N.
