I am using using Open Lab CDS and am having an issue with setting up the SIM acquisition method. I have selected 74m/z as the unique ion to this compound group. For the fatty acids which do not include 74m/z as part of their spectra, I would like to select their characteristic ion to monitor. I am able to do this for the majority of the compound list, but for some when selecting plot ion I receive the following error "The number of signals displayed in the real time plot is 13 and is limited to 12." When I deselect this ion, the error is resolved. Any ideas on how to resolve this issue?