[PyMOL] How to color based on b-factor for all the frames in one object in Pymol?

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I load a protein.pdb file into Pymol. This file has multiple frames (or states), and with different b-factor values at different frames at the PDB file b-factor columns.

After running the "spectrum b" command, the colouring is only based on the last state of the object.


So can I colour the frames differently using their corresponding b-factor values? In that case, I can see the colour changing throughout the frame playing.