-1=if (group.getLength()<=15.5) return 0.0;else if (group.getLength()<=18.7) return 0.25;else if (group.getLength()<=21.9) return 0.62;else if (group.getLength()<=31.5) return 0.80;else return 1;
1=if (group.getLength()<=15.5) return 0.20;else if (group.getLength()<=18.7) return 0.37;else if (group.getLength()<=21.9) return 0.94;else if (group.getLength()<=31.5) return 1;else return 1;