Comparison of the high-resolution CO 2−1 emission with the high-resolution 1.4 GHz emission in the central region of the Medusa. Black contours and gray scale background represent the higher resolution CO 2−1 emission (0.43′′ × 0.38′′). The high-resolution combined MERLIN and VLA data are represented by magenta contours. The cross marks the position of the 1.4 GHz radio continuum peak of the MERLIN observations by Beswick et al. (2005). The beam sizes are depicted, according to the color schemes, in the lower right corner.