FWIW, I've not taken the number quoted by the website ("at least x bits", which appears to be the maximum of the per-characteristic numbers, which sort of assu

FWIW, I've not taken the number quoted by the website ("at least x bits", which appears to be the maximum of the per-characteristic numbers, which sort of assumes that the characteristics are fully dependent (such that knowing further characteristics does not tell you anything beyond that one maximally informative characteristic)), but the sum of the per-characteristic numbers (which sort of makes the opposite assumption that the characteristics are fully independent, and knowing all the other characteristics does not reduce the information added by any one characteristic). So, the true number is somewhere in-between.