Hi,

I've a question concerning the convergence criterion.

Let's say I want to examine convergence of the total energy a system with 
respect to the meshcutoff.

When is convergence reached? Is it reached when there is no change in the first 
digit after the comma

like in the following example:

meshcutoff         total energy

150              -42994.1019

170              -42994.116

190              -42994.127

210              -42994.133



or is it usefull to continue the test till there is no change in the second 
digit after the comma?

What is a sensible criterion for convergence?



Thanks and regards



Stephan Ludwig

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