Which preposition to use with wavelengths

of Occurrences 2%

"With us the question of hearing is merely the question of wavelengths in the air," he replied; "the lowest audible sound having a wavelength of sixteen feet, the highest less than an inch.

in Occurrences 1%

"With us the question of hearing is merely the question of wavelengths in the air," he replied; "the lowest audible sound having a wavelength of sixteen feet, the highest less than an inch.

Which preposition to use with  wavelengths