code: function(stem, p) {
      var avDOB = Math.pow( ( stem / p.stemCnt / p.stemC) , (1 / p.stemP) );
      var ppfs= p.pfsC * Math.pow(avDOB , p.pfsP);
  
      return Math.min(p.pfsMx,ppfs);
    }
docs: Coppice Functions are based on Diameter on Stump, NOT DBH. Calculates the pfs based on the stem weight in KG