Frames a–c: DSS2 blue map (λeff = 471 nm) of G202.3+2.5. The red contours show the 13CO emission from TRAO observations integrated between 6.3 and 9.3 km s−1 (frame a: with levels between 3.3 and 8.25 K km s−1 by steps of 1.65 K km s−1) or 3.6 and 6.0 km s−1 (frame b: with levels of 2, 3 and 4 K km s−1). In frame c the contours show N2H+, emission with levels of Tmb = 1 and 3 K. The thin black lines show the footprints of IRAM or TRAO observations. The thick white lines are isocontours of Hα emission at 150 and 80 Rayleighs. The arc and bar are shown with white lines. The sources 1446 and 1454 are shown in black. Frame d: profile of DSS emission (blue line) along the cut between (α, δ) = (6:40:27.2, +10:11:37.4) and (α, δ) = (6:43:53.9, +11:31:28.8), whose intersection with the DSS map is shown by the orange line in frame c. The black line is the running median of the blue curve, and the red line shows its two-piece linear best fit. Frame e: profile in Hα along the same cut. The vertical dashed lines correspond approximately to the Hα contours in DSS maps.
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