"As you tighten the flare with a spanner, there will be a point at which the tightening torque increases suddenly. Further tighten the nut from that position using the tightening angles listed in the table."
The table lists 1/4"-3/4" if I'm not mistaken.
Going by that after hand tight, once you feel the pressure step up significantly then only do a 1/4 turn or less, 1/4 turn would equal 90* correct?
In my example I think I made up the 3/4 part, possible confusion with 1/4, but if your hand tight isn't completely snug then a 1/2 turn is possible because you have to get to the stepped up pressure first.
I learned a valuable lesson, don't post based off of a vague memory without double checking first ; ).
My apologies to anyone cranking a nut around today a full 3/4 turn after the stepped up pressure and splitting a flare.