Comparison between the input parameters of mock ALHAMBRA galaxies, consisting of random mixtures of two SSP models, and the output parameters retrieved with MUFFIT. The mock galaxies (RS-like galaxies) have average signal-to-noise ratios per filter of 20, according to the typical signal-to-noise ratio distribution presented in Fig. 7. Left panels show, from top to bottom, the one-to-one comparisons in redshift, extinction, luminosity-weighted age, luminosity-weighted metallicity, and stellar mass. Redder and bluer colours indicate regions with higher and lower solution densities, respectively. The red dashed line indicates the one-to-one relationship. Right panels present the distributions of the differences between the input and output values in each case, fitted to a Gaussian function (in red) whose mean and rms are indicated within the box.