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plotting - Plot legend doesn't appear like it should be


I constructed a plot with extra legends generated using dashed function but customarily defined legend doesn't look like plot:



Y1 = Sin[x]; Y2 = Cos[x]; Y3 = Sin[2*x] + Sin[5*x]; Y4 = 
 Sin[7*x]; Y5 = Sin[9*x];
 Plot[{Y1, Y2, Y3, Y4, Y5}, {x, 0, 15}, Frame -> True, 
 PlotRange -> {{0, 15}, All}, Axes -> {True, True}, 
 PlotLegends -> {Style["Y1", Plain, FontFamily -> Helvetica, 22], 
 Style["Y2", Plain, FontFamily -> Helvetica, 22], 
 Style["Y3", Plain, FontFamily -> Helvetica, 22], 
 Style["Y4", Plain, FontFamily -> Helvetica, 22], 
 Style["Y5", Plain, FontFamily -> Helvetica, 22]}, 
 AxesOrigin -> {0, -1}, AxesStyle -> Dashed, 

 FrameLabel -> {"r [\[Mu]m]", 
 "T [\!\(\*SuperscriptBox[\(\[InvisiblePrefixScriptBase]\), \(0\)]\
 \)C]"}, BaseStyle -> {FontSize -> 22, FontWeight -> Plain, 
 FontFamily -> Helvetica}, 
 PlotStyle -> {Directive[Orange, Thick], 
 Directive[Dashed, Red, Thick], 
 Directive[Dashing[{0.025, 0.01, 0.025, 0.01}], Purple, Thick], 
 Directive[Black, 
 Dashing[{0.025, 0.005, 0.025, 0.005, 0.005, 0.005, 0.005, 
 0.005}], Thick], 

 Directive[Blue, Dashing[{0.025, 0.01, 0.005, 0.01}], Thick]}, 
 ImageSize -> 500]

enter image description here Note legend 3,4,5 are not like the plot or defining parameters.



Answer



I think that the lengths of the LegendMarkers just need to be increased.


Y1 = Sin[x]; Y2 = Cos[x]; Y3 = Sin[2*x] + Sin[5*x]; Y4 = Sin[7*x]; Y5 = Sin[9*x];
Plot[{Y1, Y2, Y3, Y4, Y5}, {x, 0, 15}, Frame -> True, 
 PlotRange -> {{0, 15}, All}, Axes -> {True, True},
 BaseStyle -> {FontSize -> 22, FontWeight -> Plain, FontFamily -> Helvetica},

 PlotLegends -> LineLegend[(Style[#, 22] &) /@ {"Y1", "Y2", "Y3", "Y4", "Y5"},
   LegendMarkerSize -> 75],
 AxesOrigin -> {0, -1}, AxesStyle -> Dashed,
 FrameLabel -> {"r [μm]", "T \!\(\*SuperscriptBox[\([\), \(o\)]\)C]"},
 PlotStyle -> {{Orange, Thick},
   {Dashed, Red, Thick},
   {Dashing[{0.025, 0.01, 0.025, 0.01}], Purple, Thick},
   {Black, Dashing[{0.025, 0.005, 0.025, 0.005, 0.005, 0.005, 0.005, 0.005}], Thick},
   {Blue, Dashing[{0.025, 0.01, 0.005, 0.01}], Thick}}, 
 ImageSize -> 500]


Plot with larger legend marker lengths


Update


Given your comment below about being good for a research article and if you really had to stick to a single figure, I would just use solid lines of varying thickness and color contrasts. Here's an example (and certainly not the best choice):


Plot[{Y1, Y2, Y3, Y4, Y5}, {x, 0, 15}, Frame -> True, 
 PlotRange -> {{0, 15}, All}, Axes -> {True, True}, 
 BaseStyle -> {FontSize -> 22, FontWeight -> Plain, FontFamily -> Helvetica}, 
 PlotLegends -> (Style[#, 22] &) /@ {"Y1", "Y2", "Y3", "Y4", "Y5"}, 
 AxesOrigin -> {0, -1}, AxesStyle -> Dashed, 
 FrameLabel -> {"r [\[Mu]m]", "T \!\(\*SuperscriptBox[\([\), \(o\)]\)C]"}, 

 PlotStyle -> {{Green, Thickness[0.01]}, {Blue, Thickness[0.01]}, 
   {Purple, Thick}, {Red, Thick}, {Cyan, Thick}}, 
 ImageSize -> 500]

Figure with solid lines


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