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Exercise 6: Si charge (using PWgui)• from SCF calculation of Si bulk to visualization of its chargedensity with xcrysden. Use pwgui to construct appropriateinput files and run the necessary calculations:– SCF calculation: use pw.x program– postprocessing: use pp.x program (select the “chargedensity”,and transform the chargedensity to XSF format,suitable for xcrysden)– visualize the calculated charge density stored in file.xsfwith xcrysden