My plot has two axis, one with a bar chart, the other with two line charts. I want a shared legend for all the charts now. I'm quite before the target, but the symbol for LegendS becomes a striped line - and not "minibars". How to fix that? I'm also open for other solutions without a matrix.  MWE:  \documentclass[a4paper]{article}  \usepackage{pgfplots} \pgfplotsset{compat=newest} \usetikzlibrary{matrix}  \begin{document}     \begin{tikzpicture}[scale=1.5]       \begin{axis}[               axis y line=left,                axis x line=bottom,               enlarge x limits=0.1,                enlarge y limits=0.08,                ylabel={Label Y1},               xlabel={LabelX},               symbolic x coords={1,2,3,4,5,6},               xtick=data,               legend columns=-1,           ]                       \addplot [ybar,draw=brown!80!black,fill=brown!20] coordinates {(1,93) (2,59.36) (3,48.43) (4,43.16) (5,39.96) (6,38.1)};           \label{pgfplots:plot1}       \end{axis}       \begin{axis}[               axis y line=right,               axis x line=none,               enlarge x limits=0.1,                ylabel={Lavel Y2},               xtick=data,           ]            \addplot coordinates {(1,0) (2,2212) (3,2453) (4,2677) (5,2872) (6,2895)};           \label{pgfplots:plot2}            \addplot coordinates {(1,0) (2,1726) (3,2238) (4,2513) (5,2641) (6,2756)};               \label{pgfplots:plot3}       \end{axis}        \matrix[           matrix of nodes,           anchor=north west,           draw,           inner sep=0.2em,           column 1/.style={nodes={anchor=center}},           column 2/.style={nodes={anchor=west},font=\strut},           draw       ]       at([xshift=-1.1cm,yshift=-1.1cm]current axis.south){           \ref{pgfplots:plot1}&amp; LegendS\\           \ref{pgfplots:plot2}&amp; LegendA\\           \ref{pgfplots:plot3}&amp; LegendB\\};     \end{tikzpicture}  \end{document}
I am trying to make a histogram with the fitted curve plotted on it. Here's the mwe:   \documentclass[a4paper]{scrartcl}     \usepackage{tikz}     \usepackage{pgfplots,pgfplotstable}     \usepackage{filecontents}     \pgfplotsset{compat=1.10}     \usepackage[active,tightpage]{preview}     \setlength\PreviewBorder{2pt}     \newcommand{\plots}{0.611201}     \newcommand{\plotm}{2.19882}     \begin{filecontents}{data.dat}     2 0.0629921259843     3 0.0236220472441     4 0.0314960629921     5 0.125984251969     6 0.0629921259843     7 0.102362204724     8 0.110236220472     9 0.0551181102362     10 0.0629921259843     11 0.0314960629921     12 0.0236220472441     13 0.0314960629921     14 0.0629921259843     15 0.0551181102362     16 0.0393700787402     17 0.0472440944882     18 0.00787401574803     19 0.0393700787402     24 0.00787401574803     27 0.00787401574803     33 0.00787401574803     \end{filecontents}     \begin{document}     \begin{preview}      \begin{tikzpicture}     \begin{axis}[     yticklabel style={/pgf/number format/fixed},     scaled y ticks = false,     minor y tick num={1},     xtick pos=left,     legend cell align = left,     legend style={draw=none},     xlabel = {group size},     ylabel = {ratio}     ]     \addplot[blue,ybar,fill, fill opacity=0.3, bar width = 0.8,] table {data.dat};     \addplot[red, line width = 1,domain=1:40,samples=100] {1/(x*sqrt(2*pi)*\plots)*exp(-(ln(x)-\plotm)^2/(2*\plots^2))};     \legend{empirical,lognormal fit}     \end{axis}     \end{tikzpicture}     \end{preview}     \end{document}     As you can see, the legend is not really good. How can I change the legend so it looks more like this?
I was told that the Galilean relative velocity rule does not apply to the speed of light. No matter how fast two objects are moving, the speed of light will remain same for both of them.   How and why is this possible?   Also, why can't anything travel faster than light? Movie Clip On Plane In blender cycles render engine, how do I put a movie clip on a plane so it displays the video? I want the video to be on the plane if there is a way. Can words like "what" be the subject of a sentence? In a question like "Who hears a noise?",  is the subject of the sentence who?  I can think of a few tests for subjects like: "the subject is the phrase that inverts with the auxiliary to form a question". But this is a question and there is no auxiliary. We could say that's because it's a subject, but that would be just to presuppose that it's a subject in the first place.  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