  To analyze the vertical structure of edge-on galaxies, we have used images of
a large uniform sample of flat galaxies that have been taken during the 2MASS
all-sky survey. The photometric parameters, such as the radial scale length,
the vertical scale height, and the deprojected central surface brightness of
galactic disks have been obtained. We find a strong correlation between the
central surface brightness and the ratio of the vertical scale height to the
vertical scale length: the thinner the galaxy, the lower the central surface
brightness of its disk. The vertical scale height does not increase
systematically with the distance from the galaxy center in the frames of this
sample.
