Hi everyone!

What does "Delta C1" of "Abrahamson et al. (2016) - BCHydro" really means?

I've noticed that it requests a number (not a letter L[Low Values],C[Central Values] or U[Upper Values]) to run. I'd been wondering if RCRISIS has some other convention because i haven't been hable to figure it out yet.

Will I need to run RCRISIS with diferent "Delta C1" for every period to obtain the final results or only , for example, "Delta C1" associated with PGA to recognise the values of the table attached?

Thank you so much for your help !!