title: Default linetypes in ggplot2?
body: <p>I am struggling here to figure out the default linetypes used in ggplot2. I have a dataframe as follows: </p>
  
  <pre><code>test &lt;- structure(list(time = c(151.04167175293, 151.125015258789, 151.20832824707, 
  151.29167175293, 151.375030517578, 151.45832824707, 151.54167175293, 
  151.625015258789, 151.70832824707, 151.79167175293, 151.875030517578, 
  151.95832824707, 151.08332824707, 151.166687011719, 151.250030517578, 
  151.333343505859, 151.41667175293, 151.5, 151.58332824707, 151.666687011719, 
  151.750030517578, 151.833343505859, 151.91667175293, 151.04167175293, 
  151.125015258789, 151.20832824707, 151.29167175293, 151.375030517578, 
  151.45832824707, 151.54167175293, 151.625015258789, 151.70832824707, 
  151.79167175293, 151.875030517578, 151.95832824707, 151.08332824707, 
  151.166687011719, 151.250030517578, 151.333343505859, 151.41667175293, 
  151.5, 151.58332824707, 151.666687011719, 151.750030517578, 151.833343505859, 
  151.91667175293, 151.04167175293, 151.125015258789, 151.20832824707, 
  151.29167175293, 151.375030517578, 151.45832824707, 151.54167175293, 
  151.625015258789, 151.70832824707, 151.79167175293, 151.875030517578, 
  151.95832824707, 151.08332824707, 151.166687011719, 151.250030517578, 
  151.333343505859, 151.41667175293, 151.5, 151.58332824707, 151.666687011719, 
  151.750030517578, 151.833343505859, 151.91667175293, 151.04167175293, 
  151.125015258789, 151.20832824707, 151.29167175293, 151.375030517578, 
  151.45832824707, 151.54167175293, 151.625015258789, 151.70832824707, 
  151.79167175293, 151.875030517578, 151.95832824707, 151.08332824707, 
  151.166687011719, 151.250030517578, 151.333343505859, 151.41667175293, 
  151.5, 151.58332824707, 151.666687011719, 151.750030517578, 151.833343505859, 
  151.91667175293), value = c(0, 0, 5.61033323376278e-29, 1.54657131948427e-17, 
  9.66035151178657e-12, 5.10066877623672e-09, 5.13016118475207e-08, 
  5.63439357392781e-08, 2.30620536001425e-08, 9.08235708863003e-09, 
  8.37633162831253e-09, 1.55146210545354e-07, 0, 0, 2.25358956126054e-21, 
  2.08607626615495e-13, 1.98955163455139e-09, 9.66092130738616e-08, 
  1.91719223607834e-07, 1.09957049687637e-07, 3.104455004177e-08, 
  1.31108741641128e-08, 6.10190298289126e-08, 0, 0, 0, 0, 3.2789574202628e-30, 
  6.73093043024932e-24, 7.93898871359986e-21, 1.51219769988266e-19, 
  3.67432930162413e-19, 7.19692007469365e-19, 3.20756611951269e-18, 
  4.69377782154479e-17, 0, 0, 0, 5.28026380068047e-35, 6.81666051928849e-28, 
  2.74272295486945e-23, 3.82383180911782e-21, 1.74006456826736e-20, 
  4.48768165153377e-20, 1.60533888309098e-19, 1.53676095741939e-18, 
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
  0, 0, 0, 0, 0, 0, 8.71725244784488e-30, 1.04201812373392e-23, 
  2.36111112593732e-21, 5.04498618818828e-20, 1.39487078953905e-19, 
  9.53610723085965e-19, 2.04732743716978e-17, 2.28480170675856e-15, 
  0, 0, 0, 1.1415638533226e-32, 3.46081290989027e-27, 5.11190859597535e-23, 
  2.60199456175554e-21, 8.88056339654886e-21, 2.0802860544737e-20, 
  3.12119181655233e-19, 3.69406751642014e-17), id = structure(c(1L, 
  1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 
  2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
  1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 
  1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
  2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
  2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("a", 
  "b", "c", "d", "e", "f"), class = c("ordered", "factor")), dis = structure(c(1L, 
  1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
  1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
  2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 
  3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 
  3L, 3L, 3L, 3L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 
  4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L), .Label = c("50", 
  "100", "250", "50(nothing)"), class = c("ordered", "factor"))), .Names = c("time", 
  "value", "id", "dis"), row.names = c("1", "3", "5", "7", "9", 
  "11", "13", "15", "17", "19", "21", "23", "722", "724", "726", 
  "728", "730", "732", "734", "736", "738", "740", "742", "4321", 
  "4323", "4325", "4327", "4329", "4331", "4333", "4335", "4337", 
  "4339", "4341", "4343", "5042", "5044", "5046", "5048", "5050", 
  "5052", "5054", "5056", "5058", "5060", "5062", "8641", "8643", 
  "8645", "8647", "8649", "8651", "8653", "8655", "8657", "8659", 
  "8661", "8663", "9362", "9364", "9366", "9368", "9370", "9372", 
  "9374", "9376", "9378", "9380", "9382", "12", "32", "52", "72", 
  "92", "112", "132", "152", "172", "192", "212", "232", "7221", 
  "7241", "7261", "7281", "7301", "7321", "7341", "7361", "7381", 
  "7401", "7421"), class = "data.frame")
  </code></pre>
  
  <p>Now, I plot the above dataframe as follows:</p>
  
  <pre><code>library(ggplot2)
  ggplot(test)+
    geom_line(aes(time,value,linetype=dis))+
    facet_wrap(~id,ncol=2)+theme_bw()+
    ylab("concentration ")+coord_cartesian(xlim=c(151,181),ylim=c(-0.15,0.75))+ labs(linetype="")+
    theme(panel.margin = unit(1, "lines"))+ xlab("")+
    scale_x_continuous(limits=c(151,181),breaks=seq(151,181,5))+
    scale_y_continuous(limits=c(-0.15,1.75),breaks=seq(-0.15,1.75,0.15))+
    theme(legend.position="top",legend.key =element_blank())
  </code></pre>
  
  <p>The output is as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/YoItY.png" alt="enter image description here"></p>
  
  <p>What I am trying to know is by default what linetypes are used ? Because when I try to use <code>scale_linetype_manual("", values=c(1,2,3,4))</code> then it doesn't produce the same <code>linetypes</code> as above. </p>
  
  <p>The figure obtained by specifying linetype above is </p>
  
  <p><img src="https://i.stack.imgur.com/DzyP1.png" alt="enter image description here"></p>
  
  <p>Would someone clarify this issue ? Is it possible to achieve the same effect by specifying the linetype ? The reason I am trying to do this is before I had use default and now I need to change one linetype. </p>
  
  <p>I tried with several <code>linetypes</code> but cannot figure out what <code>linetypes</code> are used when we don't manually specify linetype. Thanks</p>
  
  <p>I don't have data for dis = "100" and "250" over here but should be able to have the same linetype.</p>
  
  <p><strong>EDIT</strong> </p>
  
  <p>The link to full dataset is as follows: 
  <a href="https://dl.dropboxusercontent.com/u/9267938/dputtest.rda" rel="noreferrer">https://dl.dropboxusercontent.com/u/9267938/dputtest.rda</a></p>