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How to Add Various Error Contributions?
 For a simple criteria as a probability level of the minimum dose the
systematic error and random error are added linearly
 For various systematic errors and various random errors the errors (SDs)
should be added in quadrature:

)10(9.10 3 3 10 2 2 2
2 2 2
=   =S
SSS=Sc b a
Emphasis on large errors!