#description:estimate M with no qCPUE, fixed steepness
#author: KO
natM_type;          1Parm
natM_n_breakpoints; NULL  
natM_lorenzen;      NULL
natM_val;           c(NA,5)
par_name;           LnQ_base_3_CPUE,CV_young,CV_old
par_int;            c(NA,NA,NA)
par_phase;          c(-1,-1,-1) 
forecast_num;       0 
