Dear Mohd, to plot the B-factors, I would read the pdb file in Excel (or similar). Take care that 5.45 is read as a number and not as a string, which happens at least in German versions because of the . instead of the German,. Specify the decimal separator. The sort by Atmon name to get all CA atoms in one block. Then, all B-factors will be in one column and you can proceed to make a plot.
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