MPLA Instruction
MPLA na atomnames
A least-squares mean plane is calculated through the first na of the named
atoms, and the equation of the plane and the deviations of all the named
atoms from the plane are listed with estimated standard deviations (from the
full covariance matrix). The angle to the previous least-squares plane (if
any) is also calculated, but some approximations are involved in estimating
its esd. na must be at least 3. If na is omitted the plane is fitted to all
the atoms specified.