Tow-dimensional histogram of the LSR velocity of the DIBs 45780 (upper panel) and 46614 (lower panel) as a function of the Galactic longitude. The medians and the standard deviations in each ∆ℓ = 10° bin are denoted by the white dots and their black error bars. The Galactic velocity curves with different heliocentric distances d calculated by the Model A5 of Reid et al. (2019) are overlaid in the plots.