Plot()
 {
  Sequence("basal_Knossos")
  {
   Boundary("start");
   Phase()
   {
    R_Date("Beta-325102_X?_grain", 7740, 40);
    R_Date("Beta-325103_X?_grain", 7690, 40);
    R_Date("BM-436_X_AC_grain", 7740, 140);
    R_Date("OxA-21418_39_grain", 7735, 40);
    R_Date("OxA-28380_39_grain", 7729, 37);
   };
   Boundary("end");
  };
  Difference("phase-length","end","start",LnN(0.5,0.5));
  Correlation("corr-start-end","start","end");
  Axis(BC(8000), BC(6000));
 };