What formula is used in arithmetic check in height of collimation method?

1
ƩB.S − ƩF.S = Last R.L − First R.L
2
ƩB.S + ƩF.S = Last R.L − First R.L
3
B.S − F.S = last R.L − First R.L
4
ƩB.S − ƩF.S = Rise − Fall = Last R.L − First R.L

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