Figure 5: Final isovector helicity PDFs (shaded bands; in the left plot, PDF in the right plot) at the largest employed nucleon boost, left: Lin et al., 1.29 GeV, right: ETMC, 1.42 GeV. The right plot also shows the quasi-PDF and the matched PDF before nucleon mass corrections. For illustration purposes, also selected phenomenological parametrizations/models are plotted (left: dashed/dotted lines, no uncertainties shown, right: unfilled black bands representing uncertainties) [206209]. The errors are only statistical. Source: left: [107], reprinted with permission by the Authors (article available under CC BY), and right: [108], reprinted with permission by the Authors and the American Physical Society.