experiment	calc-al-si	meas-al-si	rsd-al-si	calc-zn-si	meas-al-si	rsd-zn-si

single	0.00122	0.00121	0.9	1.17	1.11	2.1
bracket	0.00122	0.00122	0.6	1.17	1.17	2.1