Hi gary.........
Just take the first race.......
Time/F is the time per furlong, so in that first race it's the total time divided by 17 furlongs.
Comparison is the time of the race compared to a 'standard time' for the course and distance
Comp per F if the comparison per furlong..........so in this race it was run at 1.74 seconds per furlong above ( or slower than ) the 'standard time'
Allowance........having seen all the races and got all the race times the 'speed buffs' then try and work out the effect of the going on race times by comparing todays times against a set of 'standard times' for the course based on races of a standard class of races on good going. The allowance is an attempt to determine how much the going is responsible for slowing the horses down in todays conditions
In this case the speed buffs reckon that the ground was responsible for slowing all horses by 1.53 seconds per furlong.
So.......if, for example, a horse had run at 1.53 seconds per furlongs slower than 'standard time'.........the going allowance would be taken off and he would be credited with having run the standard time for the purposes of working out his speed rating.