Comparison between the two different methods for metal ejection implemented in GEAR. Injection into the SPH kernel and into a constant volume, as described in Sect. 3.4, are shown in blue and red, respectively, for the Sextans-like model h177. Both models are plotted as the 2D histogram of the extent of the polluted region R_ejecta, and the time at which the explosion occurs, limited to the first ∼1 Gyr of the simulation. Pixels are color-coded by the number of supernova events. In each event, R_ejecta is defined as the distance to the furthest particle that receives the supernova remnants.