This is a fully automated web-based interface for the program GraphEnt which aims to simplify the calculation of maximum entropy protein electron density maps. All you need to use this interface is a CCP4 mtz file containing the sigmaA coefficients for a [2mFo-DFc] electron density map as produced, for example, from refmac (column labels FWT-PHWT or 2FOFCWT-PH2FOFCWT). The results are given in the form of a CCP4 mtz file containing the corresponding maxent coefficients (suitable for direct input to, say, coot).

To maintain privacy and data safety, no e-mail address (or any other type of registration) is necessary and all files (including the results) will be deleted from this server upon job completion. Comments, suggestions, flames and bug reports should be directed to

Select an MTZ file (max 10 MB) :