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Damping: Tan Delta vs. Delta (degrees)

Damping: Tan Delta vs. Delta (degrees)

Damping: Tan Delta vs. Delta (degrees)

(OP)
I was given a report for a fluid damping bushing and some of the damping data is reported as Tan Delta (0.5 tan delta for 15Hz for example) and some of the damping data is given as Delta in degrees (69 or 91 degrees for 40 Hz for example).  

What is the difference?  Why not use Tan Delta for both?

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