Spatial variation of V² = (c·Δλ_D/λ₀)² versus inverse atomic mass 1 /μ for 5 spatially distinct scans in prominence No. 1. Asterisks give scan-6 (in Fig. 7); the full line connecting Hγ and He i 5015 (singlet), triplet and metals lay above that line (as in Fig. 1). The other lines similarly connect Hγ and He i 5015 (singlet) values observed for scans-2 through − 5 (in Fig. 7), and are of nearly the same steepness, T_kin = 10 650 K; their ordinate off-sets correspond to 2 ≤ V_nth ≤ 6 km s^-1.