# 10.7. Growth factor $$D(z)$$¶

Possible keyword choices for the gSIM_EXTRAGAL_FLAG_GROWTHFACTOR parameter:

 Keyword Description kPKZ_FROMFILE Compute directly $$P_{\rm lin}(k,z)$$. If no precomputed files exist, by default, CLASS is called for the computation kCARROLL92 Use the approximation by Carroll et al. (1992) kHEATH77 Compute the rigorous integral according to Heath (1977)