Solution
You could easily understand it if the center frequency of a signal is plotted on a chart as below.
Let's say we have a target signal centered at 350 MHz, and you could find that it's only 300MHz distance wide to the left bound (50MHz of PXIe-5842) :
So the equation int Table 4 is just used to try to find the appropriate Maximum BW for that particular center frequency by checking whether it's bounded by the right bound(2GHz - Cf) or the left bound(Cf - 50MHz) or 1GHz.
Maximum Bandwidth = min[1 GHz, 2 x min(Center Frequency - 50 MHz, 2 GHz - Center Frequency)]
= min[1 GHz, 2 x min(350 - 50 MHz, 2 GHz - 350)]
= min[1 GHz, 2 x min(300 MHz, 1.650 GHz )]
= min[1 GHz, 2 x 300 MHz]
= min[1 GHz, 600 MHz ]
= 600 MHz
Note: Please notice that there are 3 columns in Table 4 as there are 3 models of PXIe-5842 each with different RF frequency ranges, so the corresponding maximum bandwidth would be different as well.