Correlation coefficients of the ALHAMBRA luminosity function covariance matrix, covering only the first eight redshift ranges for illustration purposes. The axes mark the redshift bin of interest for SF-SF galaxies (cyan square), Q-Q galaxies (red square), and SF-Q and Q-SF galaxies (green squares). Each redshift box delimited by dotted lines shows the B-band luminosity correlations. The cosmic variance highly correlates galaxies at the same redshift, with the correlations between different redshift and galaxy types are caused by the photometric uncertainties.