Estimates of the velocity and compression ratio of an 8000 K isothermal shock constrained by the downstream gas densities and magnetic field strengths listed in Table 2 and by the LSR expansion velocity of 15 km s−1 of the downstream H I shells. The different directions are noted with their truncated right ascension, and the letters N, W, or S for the north rim, west rim, and south loop rims, respectively.
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