Look at the MDAMP command in the help manual.
We can define a command snippet using the above command defining the damping ratio for each mode.
Thus depending on the mode and its frequency you will add the damping ratio you have/showing in your graph/table.
A sample command is (adding damping ratio to 6 modes):
mdamp,1,.01,.04,.03,.04,.05,.06 ! specify modal damping for modes 1 to 6
Best of luck
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