CMYK image, 300 d.p.i., PDF format

For image size: 8w X 10h (inches), COLOR (2.8 MB), or BLACK & WHITE (1.1 MB)

For image size: 5w X 6.25h (inches), COLOR (1.4 MB), or BLACK & WHITE (510 kB)

Photo credit: C.L. Zoll and R. McNair