select mass 1.0 amu 2.0 amu 3.0 amu 4.0 amu



select mass 1.0 amu 2.0 amu 3.0 amu 4.0 amu



select mass 1.0 amu 2.0 amu 3.0 amu 4.0 amu



select mass 1.0 amu 2.0 amu 3.0 amu 4.0 amu

*note about units