Hi R-Users, I failed at drawing multiple filters in a densityplot() using the FlowCore/FlowViz packages. I found a way to draw multiple filters in xyplot(), using the glpolygon method within the panel-function, but some similar attempts for densityplot failed. I could draw simply some vertical lines using panel.abline, but this doesn't look as appealing as the original method when using a single filter with the standard filter=xyz argument. I bet there is a method to draw multiple gates through the panel- function, as the curv1filter can also identify multiple peaks automatically and draw them in a densityplot... This script works for  xyplot but not for densitylot:     library(flowCore)     library(flowViz)     data(GvHD)     Filter1        <-    rectangleGate(filterId="Filter1", "FSC-H" = c(0, 200))     Filter2        <-    rectangleGate(filterId="Filter1", "FSC-H" = c(300, 400))     xyplot( `SSC-H` ~ `FSC-H` , data=GvHD[[1]],         panel = function(...) {             panel.xyplot.flowset(...)            glpolygon( Filter1 )            glpolygon( Filter2 )         }     )     densityplot( ~ `FSC-H`, data=GvHD[[1]],         panel = function(...) {             panel.densityplot.flowset(...)             glpolygon( Filter1 )             glpolygon( Filter2 )         }     ) The glpolygon method yields not the "typical" look of the densityplot filters, but red lined gate boundaries. Thank you in advance. All the best, Michael -- Michael Jahn PhD student Helmholtz-Centre for Environmental Research Leipzig, Germany http://www.ufz.de(http://www.ufz.de/) [[alternative HTML version deleted]]