SBPRfunc calculate spaning biomass per recruit based on
parameters
| 1 | SBPRfunc(F, Rzero, NatM, vuln, mature, weight, LenAtAge, MaxAge)
 | 
| Rzero | recruitment at eq | 
| NatM | natural mortality | 
| vuln | vulnerability to fishing | 
| mature | maturity at age | 
| weight | weight at age | 
| LenAtAge | length at age | 
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