ABAQUS Volume II: I–Z - Manual (Page 454)

*SPECTRUM
Date lines to define a spectrum:
First line:
1. Magnitude of the spectrum.
2. Frequency, in cycles per time, at which this magnitude is used.
3. Associated damping, given as ratio of critical damping.
Repeat this data line as often as necessary to define the spectrum at all frequencies at each damping
value.
18.28–2
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