You should be very aware that spur levels are very difficult to predict in an absolute manner. Fractional spurs can also be highly dependent on fractional modulus, output frequency, voltage, and prescaler used. Despite all these drastic variations, these spur predictions are within 5 db more often than not. Also, if two EasyPLL designs are compared with everything the same, except for the loop filter, then relative comparisons regarding spur levels tend to be much more accurate. For these estimates, the assumption is that dominant effects, leakage and pulse effects cause the spur.
Leakage refers to the charge pump leakage in the tri-state mode and is specified in the datasheet.
Pulse effects refer to all other effects including charge pump mismatches, unequal transistor turn on times, and imperfections in fractional calibration circuitry in the case of a fractional spur. The phase noise graph allows you to see the impact of the various contributors of phase noise including the PLL, VCO, and loop filter resistors. Each noise source can be enabled and disabled individually in order to see what its impact on the total phase noise. The graph can be rescaled by entering rescaling parameters for Hmin and Hmax, then clicking on Re-Display . The Bode plot is a useful way to verify if a design is optimized and performs to the parameters that is was designed for.