private void resetOffsets () {
		int minOffset = 0;
		for (Read read : layoutMap.values()) {
			if (read.getOffset() < minOffset) {
				minOffset = read.getOffset();
			}
		}
		if (minOffset != 0) {
			for (Read read : layoutMap.values()) {
				read.setOffset(read.getOffset() - minOffset);
			}
		}
		
	}