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Three sets of nomograms permitting calculation of tropospheric refractive index, refractive index discontinuity, and vertical refractive index gradient are presented. So far as is known, no similar charts have been made for discontinuity and gradient calculations. All three have been designed about the standard radiosonde transmission, which gives temperature, dew-point temperature, and pressure at points where discontinuities occur in the vertical gradients of temperature or dew-point temperature. These nomograms are valid for all wavelengths greater than 1.5 cm.