public int historicalNumPops (int type ){
		switch (type) {
		
		case HE_POP_SIZE:
			return 1;
		case HE_POP_SIZE_EXP:
			return 1;
		case HE_BOTTLENECK:
			return 1;
		case HE_ADMIX:
			return 2;
		case HE_MIGRATION:
			return 2;
		case HE_SPLIT:
			return 2;
		case HE_SWEEP:
			return 1;
		}

		return 0;
	}