<html dir=""><head><style id="axi-htmleditor-style" type="text/css">p { margin: 0px; }</style></head><body style="font-size: 10pt; font-family: Arial; background-image: none; background-repeat: repeat; background-attachment: fixed;">​Dear users.<br><br>I am trying to calculate cohesive energy. As it is mentioned in FAQ, we must create FCC supercell and also use identical RKmax and RMT. Now i have two question?<br><br>1- Can i choose Cubic (P) supercell instead of FCC. In other words, is there any reason for that choosing?<br>2- what is the good or best value for RKmax or RMT. (actually i automatically chose RMT for one element equal to 2.5 and consequently RKmax also 2.5. Is this value valid?)<br><br><br>Thank you in advance.<br><br></body></html>