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# Number of bands NBANDS

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To check this parameter perform several calculations for a fixed potential (ICHARG=12) with an increasing number of bands (e.g. starting from NELECT/2 + NIONS/2). An accuracy of ${\displaystyle 10^{-6}}$ should be obtained in 10-15 iterations. Mind that the RMM-DIIS scheme (ALGO=Fast) is more sensitive to the number of bands than the default Davidson algorithm (ALGO=Normal).