FIG. 4A is a schematic drawing showing a front view of the sample holder 500; FIG. 4B is a schematic drawing showing a top view of the sample holder shown in FIG. 4A; FIG. 4C is a cross-sectional view through the sample holder shown in FIG. 1A along line C-C; and FIG. 4D is a perspective view of the sample holder shown in FIG. 4A. The adaptor 400 converts the male inlet 107 of apparatus 100 into a