Of course, these sample vials are intended to be exemplary, and other shapes, sizes andcombinations of shapes and sizes may be used in other embodiments.Referring to FIGS. 2-6, the sample rack 100 may be configured to accommodate a number of different vials by using a variety of well shapes to accommodate each vial shape.As shown in FIGS. 2 and 3, the first well shape 201 comprises a combination o