The [*.spd] data which is stored in the block memory or in the [File > Record file] is a text data which is separated by comma. It can be easily read on an Excel screen when you change the extension [spd] to [csv].

 

The stored data of the center frequency is from 0.5 Hz to 20 kHz, but the overall value is the sum of the band data of the frequency range which is displayed on the screen while storing the data.

 

 

Figure: The data which is stored as [*.spd] in the [File > Record File]