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Fema 310

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Does anyone know how to use table on page 37.Ss is the short
period acceleration from the curv (.2 sec).  when i get my information
from the maps i get
2% 50 years
pga          83.93%
.2 sec sa   188.3
.3 sec sa   183.2
1. sec sa   73.6

For site class E, I should get 2.5.{from past experience I would guess

Ss is defined as the maximum spectral acceleration at short periods. 
how do I use this table to get my answer. I want to solve equation

Thank you

Ken Tarlow
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