Rf system design question about c1101 datasheet

[alaa1231]

Hello
can anyone help me
I want to understand something about blocking in texas instruments datasheet c1101
I this attached file , in the table it talk about blocking @ 2 Mhz and 10 mhz has values -50 and -40 dbm then in graph it show selectivity
is this graph show the attenution for these blockings for example @ 10 mhz in graph it show value = 50 db is that the attenuation for block coming of value of -40dbm (as from table ) also what is meant by @ 0 mhz selectivity is -12db is that gain!!!!!!!!!!

Second
We use here gfsk modulation what is bandwidth at (if) frequency ,I mean fc is it equal Fif +(channel spacing)/2 = 304 + 750/2 =679k is that right

 

[biff44]

TI data sheets, in general, assume the interferer signal is a CW unmodulated tone! In the real world, you will not see that sort of performance. ALso, these chips have a "low IF" design, so you have to worry about any interferer at the image frequency.