An experimental study was conducted to determine the effect of aspect ratio, wall angle, and wall offset on the shape of pressure contours in the reattachment bubble of a symmetrical bistable fluid amplifier. The model was operated without control flow at a nominal nozzle exit Mach number of .45 and a nominal exit stagnation pressure of 4.05 "Hg. gauge exhausted to atmosphere. special attention was paid to trends in the location of and pressure within the minimum pressure region of the recirculation bubble. Pressure contour maps were graphed for aspect ratios of four, six, eight, and ten; offsets of two, four, and six nozzle widths; and wall angles of ten, twenty, and thirty degrees. The results are expressed as a series of pressure maps. The reattachment distances obtained were in fairly good agreement with the results found by others at lower Mach numbers.