The code calculates the extinction, scattering and absorption efficiency factors for prolate or oblate homogeneous spheroids. ... We provide the code with a test input file and two output files. A run of the code with such an input should lead to the results given in the output files. ... Parameters: . ... Values of other parameters are specified in the input file homn.dat . ... Voshchinnikov N.V., Farafonov V.G. Optical properties of spheroidal particles, . ...