Respiratory mask
FIG. 1 is a perspective view of a respiratory mask showing our new design, the broken lines of values and straps are for illustrative purposes only and form no part of the claimed design; 
     FIG. 2 is a side elevational view thereof, the opposite side elevational view being a mirror image of that shown; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image of that shown; and 
     FIG. 5 is a rear elevational view thereof.