Trips,

thank u for ur reply

1. can u give me any reference for ur statement "The ZPA used for missing mass is not the ZPA as entered in the control parameters". because for our past and present projects we are giving ZPA( for user defined spectrum also) even PMC specifies that use zpa=0.385 (for user defined spectrum also)

2. can u pls do a small activity.

use ur own spectrum , and in config file MISSING MASS ZPA put spectrum ( it means CAESAR II use the largest entered frequency corresponding acceleration value as ZPA)check the include missing mass data.

change that largest frequency corresponding acceleration value and check the missing mass data NO CHANGE??? why ..

even if u change to extracted mode(CAESAR II will use acceleration associated with the frequency of the last extracted mode. So this value depends up on Cut‐off frequency.) still included missing mass data is same... what it mean?????

neither it is changing for spectrum nor it is changing for extracted mode??? i didnt understand what ZPA value CEASAR is taking for calculating the included missing mass....