PPD | Understanding Structural Systems and Seismic Impact of Design [Exercise A]

Real-World Practice
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Property 1=PPD Understanding Structural Systems and Seismic Impact of Design [Exercise A]

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Can someone explain how to use IBC table 1604.3. The exercise mentions the following: A 20-foot roof beam is constructed from a steel wide flange section and supports a non-plaster ceiling with a point load of 20 psf at midspan.

Per IBC, what is the maximum allowable deflection in inches?

But the IBC table has 3 columns

Thanks!