# modifying xmin value and frame of a plot

Would you please let me now how to modify min value of this plot? I want to make x axis begin from 13, but I can't modify the minimum value of the frame. Now I have no idea what to do....

```
var('I, r, L_s, z, g, f1, f2, f3, f4, c1, c2, c3, g1, g2, g3, Lg1, Lg2, Lg3, Lg4, Lg5, cp1, cp2, cp3')
f1=1/r^2*exp(-r/50);
f2=2.4/r^2*exp(-r/50);
f3=4/r^2*exp(-r/50);
f4=5/r^2*exp(-r/50);
f5=15/r^2*exp(-r/50);
Lg1=plot(f1, (x, 13, 200), ticks=[[log(13)/log(10), 10^2],[0.000005, 1/5, 10^-5, 10^-4, 10^-3, 10^-2, 10^-1]], scale=('loglog', 10), ymin=0, ymax=0.1, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=True, legend_label='I=1 cd', frame=True, color='blue', title='L_s(scattering length)=50m');
Lg2=plot(f2, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, legend_label='I=2.4 cd', frame=True, color='black');
Lg3=plot(f3, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, legend_label='I=4 cd', frame=True, color='red');
Lg4=plot(f4, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, legend_label='I=5 cd', frame=True, color='green');
Lg5=plot(f5, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, legend_label='I=15 cd', frame=True, color='violet');
cp4=plot(0.000001, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, frame=True, color='gray', linestyle='dashed');
cp5=plot(0.0005, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, frame=True, color='gray', linestyle='dashed');
Lg1.set_legend_options(loc=1);
cp6=plot(0.00008, (x, 13, 200), ymin=10^-4, ymax=0.3, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, frame=True, color='gray', linestyle='dashed');
cp3=plot(0.2, (x, 13, 200), ymin=0, ymax=0.1, axes_labels=['Distance between led and camera [m]','Illuminace on camera sensor[lux]'],axes=False, frame=True, color='red', linestyle='dashed');
g=line([(20,0), (20, 0.1)], color='black')
z= g + Lg1 + Lg2 + Lg3 + Lg4 + Lg5 + cp3 + cp4 + cp5 + cp6;
```