Input and output quantities for the deep learning algorithm. Each panel corresponds to the same SGX–SGY slice of width −7.5 < SGZ < 7.5 Mpc h⁻¹ and of various quantities. From left to right: (a) mock data from which the input and output quantities have been generated, (b) galaxy number density N_gal, (c) mean radial peculiar velocity V_pec, (d) true dark matter density field, and (e) true gravitational potential field.