. . "pect of the present invention. [0083]FIGS. 39 a and b are a top view and side view, respectively, of the depth gauge of FIG. 38. [0084]FIG. 40 is a top view of a depth gauge in combination with a distraction window according to another aspect of the present invention. [0085]FIG. 41a and 41 b are a top view and side view, respectively, of the depth gauge of FIG. 40." . . .