Comparison of the signal of reduced bispectrum obtained from 80 mock catalogues generated with BAM (using the TkWEB model) and the same signal from the reference set, for several triangle configurations, which are specified in each panel. The left column shows the ratio to the reference (RTF) of the mean (solid lines) and variance (dashed lines); the shaded areas in the panels of this column denote a 20% deviation from unity. The right column shows two elements of the correlation coefficients of the bispectrum r_ij.