dictionary {
* file growth1.dct
* Exponential growth - model 1 -  without limitation
        str60  _model
}

"S  W=W+dt*GR    Weight (g)                  "
"R  GR=RGR*W     Growth rate (g/day)         "
"I  W=5          Initial weight (g)          "
"P  RGR=0.1      Relat. growth rate (g/g/day)"