Templates used in the inversion. The top five images are the Hi templates, the following five are the molecular templates, all of which are presented in increasing Galactocentric radius (the radii defining each ring are described in Sect. 3.2). The final three templates are the free-free, synchrotron, and dark gas templates, respectively. The units are all expressed in 10²⁰ atoms, except for synchrotron, expressed in MJy sr^-1. The centre and anti-centre regions have been masked as no distance information can be obtained from the radial velocity of the gas.