#description: Single fixed M at mle, no CPUE, no length-at-age
natM_type;          NULL      
natM_n_breakpoints; NULL  
natM_lorenzen;      NULL
natM_val;           c(NA,-3)
par_name;           _steep,LnQ_base_3_CPUE,CV_young,CV_old
par_int;            c(NA,NA,NA,NA)
par_phase;          c(-4,-1,-1,-1) 
forecast_num;       0 
