This is a plot of sine integral and cosine integral functions (for 0&lt;x≤8π{\displaystyle 0&lt;x\leq 8\pi }).
The plot was produced by the following MATLAB code:

x = 0:0.01*pi:8*pi;
Si = sinint(x); Ci = cosint(x); % requires Symbolix Math Toolbox
 
plot(x,Si, x,Ci);
margin = 0.3;
axis([min(x)  max(x)  min([min(Si),min(Ci)])  max([max(Si),max(Ci)]) + margin])
title('{\bfSine integral} and {\bfcosine integral}');
legend('Si({\itx})', 'Ci({\itx})', 'Location','SouthEast')
xlabel('{\it{\bfx}}')

The plot was converted to SVG using the plot2svg function from MATLAB Central.
Own work
DmitTrix