Mark a point on the mask that's about 1/4" (6 mm) above the center of the V-shaped cutout.
Draw two straight lines connecting that point to the two points where the upper strap connects to the mask.
Draw two more straight lines connecting the two points where the lower strap connects to the mask to points about 1/8" (3 mm) above the shallow angles along the bottom edge of the mask, as pictured.
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Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
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