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several group number, then with b ± a, =c,c is is methyl b two vercal box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vercal installaon accurate. For example a, b, and c valueswhile on horizontal vercal errors for measurement, General in iron angle code bit at measurement level points grid errors, speci(c method is from baseline to methyl vercal box center line distance for a,, to b vercal box distance for b, list can