I've made a fit of the histograms of pathlength corrected crystal energies of four biggest GCR peaks( B, C,N and O) for 5 time periods with distance ~4 month between periods (oct 2008, feb2009, jul2009, nov2009, mar2010).
The histograms with fits are shown on the following plots:
The fitting function contains for each peak a gaussian convolved with two exponential tails (the slope of left tail was fixed during fitting).
The following plot show the time evolution of peak positions for B, C, N and O peaks: