In this case, SEAMCAT takes the positive values of the blocking mask and considers the underlying measurement procedure (see for instance ETSI EN 300 113 (section 9 therein)) by this calculation:
(Eq. 124)
where
block_protection ratio the positive values in dB from the mask (2)
C/(N+I), (N+I)/N and I/N the input parameters of the VLR
Figure 394: Setting up the blocking response in the Protection ratio mode