Heliocentric evolution of the total production rates of water (black, assumed to be 500 × Q_H2¹⁸O), methanol (cyan), carbon monoxide (green), and ammonia (magenta) from July 2014 to September 2016, based on mapping data. The horizontal scale is the heliocentric distance (pre-perihelion on the left, and post-perihelion on the right). Empty down-pointing triangles correspond to 3σ upper limits. Dotted lines are power-law fits to the heliocentric evolution (see Table 5).