Theoretical power spectrum obtained from Eq. (11). The blue line shows the linear matter-matter power spectrum for the UNIT cosmology at z = 1. The b₁ parameter is the same for all cases, and we chose it to be similar to the one expected for the DESI emission-line galaxies (ELGs) at that redshift (DESI Collaboration 2016). The orange line corresponds to the case of a biased tracer with Gaussian initial conditions. The green line shows the effect of a non-Gaussian contribution with f_NL = 100 and a PNG-response parameter b_ϕ given by Eq. (13) with p = 1. The red line displays how a different value of f_NL can lead to the same signal if the b_ϕ parameter does not follow the universality relation. Red and green lines are on top of each other since the product b_ϕf_NL is the same. Finally, the purple line shows the kind of signal we expect in case b_ϕf_NL < 0.