Covariance density, , as a function of halo mass, M₅₀₀, and redshift, z. Number count is considered for z< 0.1, power spectrum and bispectrum are at at ℓ = 250. The plots are organized as for Fisher forecasts. On the diagonal are covariance density for the auto-probe variance, with from left to right: contribution to the variance of number counts, power spectrum and bispectrum. Off-diagonal plots represent cross-probes covariance density, with from left to right and top to bottom, covariance between: number counts and spectrum, number counts and bispectrum, and between power spectrum and bispectrum. The color scale is consistent between panels and represents the total amount of correlation between probes.