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Hello,
in a NEB calculation the distances in the MEP between images must be the same (within 2 decimals ?). The distance in the MEP between any of the two end points and the nearest image should be the same as between images after optimization ? Initially, all the distances between nearest neighbors (image-image, image-end point) are the same number, after linear interpolation.
Thanks a lot !.
Best regards,

Hi,

For the initial guesses, the inter-image distances could be different (in case of manual editing). During NEB inter-image distances become equal.

Cheers