A two-dimensional plot for an LC-CE-MS analysis of 200 fmol of a tryptic digest of a BSA and enolase mixture. LC flow rate: 65 nL/min, MPA: 0.1% formic acid in water, MPB: 0.1% formic acid in acetonitrile, gradient: 5 to 50% B in 30 min, CE BGE: 1% formic acid, 25% acetonitrile, field strength: 1.1 kV/cm.