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Dear Sirs If I tried: \starttext \startluacode sample = {10,30,30,40} function MP.GetP() mp.print(sample) end \stopluacode \startMPcode draw lmt_chart_bar [ width = 8cm, height = 10mm, samples = {lua.MP.GetP()} , trace = true, maximum = 100, linewidth = 1mm, showlabels = false, originsize = 0, labelanchor = "lft", labelcolor = "black" labelstyle = "bfxx" legendstyle = "tfxx", labelstrut = "yes", ] ; \stopMPcode \stoptext This works. But with an extra element in the sample table: \starttext \startluacode sample = {10,30,30,40,50} function MP.GetP() mp.print(sample) end \stopluacode \startMPcode draw lmt_chart_bar [ width = 8cm, height = 10mm, samples = {lua.MP.GetP()} , trace = true, maximum = 100, linewidth = 1mm, showlabels = false, originsize = 0, labelanchor = "lft", labelcolor = "black" labelstyle = "bfxx" legendstyle = "tfxx", labelstrut = "yes", ] ; \stopMPcode \stoptext Don't works anymore. Why? Thanks for your time and support. Sent with a Spark