title: R ggplot2 legend inside the figure
body: <p>So, I have the following data.frame, and I want to generate two plots in one graph for yval vs. xval, for each zval and type tp. The lef</p>
  
  <pre><code>&gt; df
      xval         yval           se zval cond
  1    1.0 1.831564e-02 1.831564e-03    0    a
  2    1.2 2.705185e-02 2.705185e-03    0    a
  3    1.4 3.916390e-02 3.916390e-03    0    a
  4    1.6 5.557621e-02 5.557621e-03    0    a
  5    1.8 7.730474e-02 7.730474e-03    0    a
  6    2.0 1.053992e-01 1.053992e-02    0    a
  7    2.2 1.408584e-01 1.408584e-02    0    a
  8    2.4 1.845195e-01 1.845195e-02    0    a
  9    2.6 2.369278e-01 2.369278e-02    0    a
  10   2.8 2.981973e-01 2.981973e-02    0    a
  11   3.0 3.678794e-01 3.678794e-02    0    a
  12   3.2 4.448581e-01 4.448581e-02    0    a
  13   3.4 5.272924e-01 5.272924e-02    0    a
  14   3.6 6.126264e-01 6.126264e-02    0    a
  15   3.8 6.976763e-01 6.976763e-02    0    a
  16   4.0 7.788008e-01 7.788008e-02    0    a
  17   4.2 8.521438e-01 8.521438e-02    0    a
  18   4.4 9.139312e-01 9.139312e-02    0    a
  19   4.6 9.607894e-01 9.607894e-02    0    a
  20   4.8 9.900498e-01 9.900498e-02    0    a
  21   5.0 1.000000e+00 1.000000e-01    0    a
  22   5.2 9.900498e-01 9.900498e-02    0    a
  23   5.4 9.607894e-01 9.607894e-02    0    a
  24   5.6 9.139312e-01 9.139312e-02    0    a
  25   5.8 8.521438e-01 8.521438e-02    0    a
  26   6.0 7.788008e-01 7.788008e-02    0    a
  27   6.2 6.976763e-01 6.976763e-02    0    a
  28   6.4 6.126264e-01 6.126264e-02    0    a
  29   6.6 5.272924e-01 5.272924e-02    0    a
  30   6.8 4.448581e-01 4.448581e-02    0    a
  31   7.0 3.678794e-01 3.678794e-02    0    a
  32   7.2 2.981973e-01 2.981973e-02    0    a
  33   7.4 2.369278e-01 2.369278e-02    0    a
  34   7.6 1.845195e-01 1.845195e-02    0    a
  35   7.8 1.408584e-01 1.408584e-02    0    a
  36   8.0 1.053992e-01 1.053992e-02    0    a
  37   8.2 7.730474e-02 7.730474e-03    0    a
  38   8.4 5.557621e-02 5.557621e-03    0    a
  39   8.6 3.916390e-02 3.916390e-03    0    a
  40   8.8 2.705185e-02 2.705185e-03    0    a
  41   9.0 1.831564e-02 1.831564e-03    0    a
  42   9.2 1.215518e-02 1.215518e-03    0    a
  43   9.4 7.907054e-03 7.907054e-04    0    a
  44   9.6 5.041760e-03 5.041760e-04    0    a
  45   9.8 3.151112e-03 3.151112e-04    0    a
  46  10.0 1.930454e-03 1.930454e-04    0    a
  47   1.0 3.726653e-06 7.453306e-07    0    b
  48   1.2 9.929504e-06 1.985901e-06    0    b
  49   1.4 2.541935e-05 5.083869e-06    0    b
  50   1.6 6.252150e-05 1.250430e-05    0    b
  51   1.8 1.477484e-04 2.954967e-05    0    b
  52   2.0 3.354626e-04 6.709253e-05    0    b
  53   2.2 7.318024e-04 1.463605e-04    0    b
  54   2.4 1.533811e-03 3.067621e-04    0    b
  55   2.6 3.088715e-03 6.177431e-04    0    b
  56   2.8 5.976023e-03 1.195205e-03    0    b
  57   3.0 1.110900e-02 2.221799e-03    0    b
  58   3.2 1.984109e-02 3.968219e-03    0    b
  59   3.4 3.404745e-02 6.809491e-03    0    b
  60   3.6 5.613476e-02 1.122695e-02    0    b
  61   3.8 8.892162e-02 1.778432e-02    0    b
  62   4.0 1.353353e-01 2.706706e-02    0    b
  63   4.2 1.978987e-01 3.957974e-02    0    b
  64   4.4 2.780373e-01 5.560746e-02    0    b
  65   4.6 3.753111e-01 7.506222e-02    0    b
  66   4.8 4.867523e-01 9.735045e-02    0    b
  67   5.0 6.065307e-01 1.213061e-01    0    b
  68   5.2 7.261490e-01 1.452298e-01    0    b
  69   5.4 8.352702e-01 1.670540e-01    0    b
  70   5.6 9.231163e-01 1.846233e-01    0    b
  71   5.8 9.801987e-01 1.960397e-01    0    b
  72   6.0 1.000000e+00 2.000000e-01    0    b
  73   6.2 9.801987e-01 1.960397e-01    0    b
  74   6.4 9.231163e-01 1.846233e-01    0    b
  75   6.6 8.352702e-01 1.670540e-01    0    b
  76   6.8 7.261490e-01 1.452298e-01    0    b
  77   7.0 6.065307e-01 1.213061e-01    0    b
  78   7.2 4.867523e-01 9.735045e-02    0    b
  79   7.4 3.753111e-01 7.506222e-02    0    b
  80   7.6 2.780373e-01 5.560746e-02    0    b
  81   7.8 1.978987e-01 3.957974e-02    0    b
  82   8.0 1.353353e-01 2.706706e-02    0    b
  83   8.2 8.892162e-02 1.778432e-02    0    b
  84   8.4 5.613476e-02 1.122695e-02    0    b
  85   8.6 3.404745e-02 6.809491e-03    0    b
  86   8.8 1.984109e-02 3.968219e-03    0    b
  87   9.0 1.110900e-02 2.221799e-03    0    b
  88   9.2 5.976023e-03 1.195205e-03    0    b
  89   9.4 3.088715e-03 6.177431e-04    0    b
  90   9.6 1.533811e-03 3.067621e-04    0    b
  91   9.8 7.318024e-04 1.463605e-04    0    b
  92  10.0 3.354626e-04 6.709253e-05    0    b
  93   1.0 6.065307e-01 1.819592e-01    1    a
  94   1.2 7.261490e-01 2.178447e-01    1    a
  95   1.4 8.352702e-01 2.505811e-01    1    a
  96   1.6 9.231163e-01 2.769349e-01    1    a
  97   1.8 9.801987e-01 2.940596e-01    1    a
  98   2.0 1.000000e+00 3.000000e-01    1    a
  99   2.2 9.801987e-01 2.940596e-01    1    a
  100  2.4 9.231163e-01 2.769349e-01    1    a
  101  2.6 8.352702e-01 2.505811e-01    1    a
  102  2.8 7.261490e-01 2.178447e-01    1    a
  103  3.0 6.065307e-01 1.819592e-01    1    a
  104  3.2 4.867523e-01 1.460257e-01    1    a
  105  3.4 3.753111e-01 1.125933e-01    1    a
  106  3.6 2.780373e-01 8.341119e-02    1    a
  107  3.8 1.978987e-01 5.936961e-02    1    a
  108  4.0 1.353353e-01 4.060058e-02    1    a
  109  4.2 8.892162e-02 2.667649e-02    1    a
  110  4.4 5.613476e-02 1.684043e-02    1    a
  111  4.6 3.404745e-02 1.021424e-02    1    a
  112  4.8 1.984109e-02 5.952328e-03    1    a
  113  5.0 1.110900e-02 3.332699e-03    1    a
  114  5.2 5.976023e-03 1.792807e-03    1    a
  115  5.4 3.088715e-03 9.266146e-04    1    a
  116  5.6 1.533811e-03 4.601432e-04    1    a
  117  5.8 7.318024e-04 2.195407e-04    1    a
  118  6.0 3.354626e-04 1.006388e-04    1    a
  119  6.2 1.477484e-04 4.432451e-05    1    a
  120  6.4 6.252150e-05 1.875645e-05    1    a
  121  6.6 2.541935e-05 7.625804e-06    1    a
  122  6.8 9.929504e-06 2.978851e-06    1    a
  123  7.0 3.726653e-06 1.117996e-06    1    a
  124  7.2 1.343812e-06 4.031437e-07    1    a
  125  7.4 4.655716e-07 1.396715e-07    1    a
  126  7.6 1.549753e-07 4.649259e-08    1    a
  127  7.8 4.956405e-08 1.486922e-08    1    a
  128  8.0 1.522998e-08 4.568994e-09    1    a
  129  8.2 4.496349e-09 1.348905e-09    1    a
  130  8.4 1.275408e-09 3.826223e-10    1    a
  131  8.6 3.475891e-10 1.042767e-10    1    a
  132  8.8 9.101471e-11 2.730441e-11    1    a
  133  9.0 2.289735e-11 6.869205e-12    1    a
  134  9.2 5.534610e-12 1.660383e-12    1    a
  135  9.4 1.285337e-12 3.856012e-13    1    a
  136  9.6 2.867975e-13 8.603925e-14    1    a
  137  9.8 6.148396e-14 1.844519e-14    1    a
  138 10.0 1.266417e-14 3.799250e-15    1    a
  139  1.0 2.096114e-01 1.676891e-02    1    b
  140  1.2 2.664683e-01 2.131746e-02    1    b
  141  1.4 3.320399e-01 2.656320e-02    1    b
  142  1.6 4.055545e-01 3.244436e-02    1    b
  143  1.8 4.855369e-01 3.884295e-02    1    b
  144  2.0 5.697828e-01 4.558263e-02    1    b
  145  2.2 6.554063e-01 5.243250e-02    1    b
  146  2.4 7.389685e-01 5.911748e-02    1    b
  147  2.6 8.166865e-01 6.533492e-02    1    b
  148  2.8 8.847059e-01 7.077647e-02    1    b
  149  3.0 9.394131e-01 7.515305e-02    1    b
  150  3.2 9.777512e-01 7.822010e-02    1    b
  151  3.4 9.975031e-01 7.980025e-02    1    b
  152  3.6 9.975031e-01 7.980025e-02    1    b
  153  3.8 9.777512e-01 7.822010e-02    1    b
  154  4.0 9.394131e-01 7.515305e-02    1    b
  155  4.2 8.847059e-01 7.077647e-02    1    b
  156  4.4 8.166865e-01 6.533492e-02    1    b
  157  4.6 7.389685e-01 5.911748e-02    1    b
  158  4.8 6.554063e-01 5.243250e-02    1    b
  159  5.0 5.697828e-01 4.558263e-02    1    b
  160  5.2 4.855369e-01 3.884295e-02    1    b
  161  5.4 4.055545e-01 3.244436e-02    1    b
  162  5.6 3.320399e-01 2.656320e-02    1    b
  163  5.8 2.664683e-01 2.131746e-02    1    b
  164  6.0 2.096114e-01 1.676891e-02    1    b
  165  6.2 1.616212e-01 1.292970e-02    1    b
  166  6.4 1.221507e-01 9.772054e-03    1    b
  167  6.6 9.049144e-02 7.239315e-03    1    b
  168  6.8 6.571027e-02 5.256822e-03    1    b
  169  7.0 4.677062e-02 3.741650e-03    1    b
  170  7.2 3.263076e-02 2.610460e-03    1    b
  171  7.4 2.231491e-02 1.785193e-03    1    b
  172  7.6 1.495813e-02 1.196651e-03    1    b
  173  7.8 9.828195e-03 7.862556e-04    1    b
  174  8.0 6.329715e-03 5.063772e-04    1    b
  175  8.2 3.995846e-03 3.196677e-04    1    b
  176  8.4 2.472563e-03 1.978050e-04    1    b
  177  8.6 1.499685e-03 1.199748e-04    1    b
  178  8.8 8.915937e-04 7.132750e-05    1    b
  179  9.0 5.195747e-04 4.156597e-05    1    b
  180  9.2 2.967858e-04 2.374286e-05    1    b
  181  9.4 1.661699e-04 1.329359e-05    1    b
  182  9.6 9.119596e-05 7.295677e-06    1    b
  183  9.8 4.905836e-05 3.924669e-06    1    b
  184 10.0 2.586810e-05 2.069448e-06    1    b
  </code></pre>
  
  <p>I have used facet_grid to generate this plot, but there is one thing that I am trying to figure out. So, the right panel is for z=0, and the left is for z=1. I want to move the line legend to inside the left panel (for Z=1) (top corner). I couldn't find the option for that. </p>
  
  <p><img src="https://i.stack.imgur.com/Qv3B5.png" alt="enter image description here"></p>
  
  <p>And here is my code that I used in R to generate the plot:</p>
  
  <pre><code>plot1 &lt;- ggplot(data=df, aes(x=xval, y=yval, group=cond, colour=cond) ) +
  + geom_smooth(aes(ymin = yval-se, ymax = yval+se, linetype=cond, colour=cond, fill=cond), stat="identity", size=1.1) +
  + scale_colour_hue(l=25) +
  + ylim(-0.1,1.3) + scale_linetype_manual(values = c('a' = 1,'b' = 2))
  
  plot1 + facet_grid(~ zval, scales="free_y") + theme(strip.text.x = element_blank(),strip.background = element_rect(colour="white", fill="white"))
  </code></pre>