"Show him that right army drill of yours, František, so that the bastard does not think he is on holiday." František Pergl, the Warden (1949-1951) in the Army Detention Centre of the 5th Department of the Ministry of National Defense General Headquarters.
We suggest and use a test for evaluation of the accuracy of the harmonic coefficients in the Earth gravity field models (EMs), in which just the harmonics of the order mmin ≤ mm ≤ mmax and degree m ≤ 1 ≤ 1max are selected from the whole EMs. These parts will be called "frequency window(s)" (FWs). We treat the FWs of various recent EMs. One FW has been constructed solely from the resonant results for 12 ≤ m ≤ 15; we call it RFW. This RFW is used as a standard, sometimes independent, for comparing and testing other FWs. By means of the FWs, radius-vectors of the relevant parts of gecid are determined and compared to those of RFW. We intend to evaluate the differences between the EMs and to distinguish the models, FWs differ significantly from the RWF. and Celý článek bude publikován v Bull. Astron. Instit., sv..1985