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  • So the value for a3 wouldn’t be a calculation, but rather a point taken off a chart.
    I’ve included a picture of the chart for 88-2, and you can see below 2A, the value is 33.1.

    The value for A3 is just a defined number that is a combination of type and rating.
    On excel would it just be a case of putting all the values into the sheet somewhere, so you could say if a1=88-2, a2=2A, a3=z1 (z1 being where the relevant figure is recorded somewhere on the sheet).


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