public PessimisticEstimator(double overhead, PessimisticEstimationType type, FFPType ffpType)
 {
     Overhead     = overhead;
     this.type    = type;
     this.ffpType = ffpType;
 }
 public PessimisticEstimator(double overhead, PessimisticEstimationType type) : this(overhead, type, FFPType.noFFP)
 {
 }