Fig. 4

Combined spectrum from slits with IDs 181,38,177 and 150, 72′′<R< 78′′. Top panel: using fxcor in IRAF, the radial velocity for the combined spectrum estimated via cross correlation is 1579 ± 96 km s-1. Bottom panel: the best fit from pPXF (solid red line) to the combined spectrum (solid black line) using 13 templates from the MILES library, gives a radial velocity of 1575 ± 6 km s-1. The residuals from the fit are shown as green points. Both estimates are consistent with the known values for NGC 7507, and are within the uncertainties of each other.
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