CALS tables columns can have widths specified in relative and absolute terms. If the sum of the absolute widths exceeds the nominal page width by $cals-table-width-threshold pixels, the relative widths are ignored. (No attempt is made to divide up the remaining width according to the relative widths.)

The computation involves floating point calculations and may have rounding errors. Setting the threshold to 1 (rather than 0) reduces false positives.