STD Noise problem

Dear All
I had a question regarding measuring1dwm STD noise in decawave 1001, I was dealing with the function dwt_readdiagnostics() in decawave.c.In this function, STD noise is initialized through the function " dwt_readfromdevice(RX_FQUAL_ID, 0x0, 8, (uint8*)&diagnostics->stdNoise);" which reads 8 bytes, but when I checked the user manual, it says that STD noise on Page 93 that has 2 bytes, I will be thankful that if someone can help me with that. and also if someone can help me with the parameters firstPathAmp1,