Blue is O-mode, green X-mode. See also linear scales, Amplitude, , as well as technical data in the header for this ESR sounding.
This sounder is operating in the mean time instead of the CADI.
DSNDi analysis (preliminary) providing much more information like critical frequencies and database.
Photo gallery of the sounder on Svalbard.
See the Tromso dynasonde at analysis plots, archives, mesospheric data and other information