As for d and x graphs ..
.. those were the days ... guess 99.9% of folk these days have not the slightest idea of what x and d means ...
they compaired the results and used the most limiting of the 4 different answers they had
Similar to one where ATC requested a wind check in the wee hours (in the olden days when people carried, but rarely used, prayer wheels) ... we all did our sums and decided that embarrassment would be minimised by averaging the answers and reporting L&V.