A START OF FREQ RMS section: RMS of the NORTH / EAST / UP eccentricities
in meters (nil when the section has no such record) and of the pattern
values, placed on the antenna's grid as the frequency's samples are.
Summary
Types
@type t() :: %Sidereon.GNSS.Antex.FrequencyRms{ pco_m: {float(), float(), float()} | nil, pcv_samples: [Sidereon.GNSS.Antex.Frequency.pcv_sample()] }