By the way, I think my bad english embarrassed my meaning. What I want
to say
is  which bond length is used as the standard? the C=N or Ca-N or even the
side chains?
Or all of them?Which angel is used to compare, the Ca-C'-N or C'-N-Ca or
others.
    At first I suppose the bond length only calculate the C=N bond, and
donnot know which one
is used as the aggel. It should be a quite stupid question for whom knows
it. Just forget it.

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