{
Int_t i;
Float_t x[1000];
Float_t y[1000];

for (i=0; i<1000; i++) 
{
   x[i] = 0.001*i;
   y[i] = 6.2831853*x[i];
   y[i] = sin(12*y[i]) + sin(17*y[i]) + sin(56*y[i]) + sin(74*y[i]);
}

TGraph *graph = new TGraph( 1000, x, y );
graph->Draw("AL");

printf( "\n\n===============================================================\n" );
printf( "Right click on X axis and select SetRangeUser.\n" );
printf( "Enter the range 0.387 to 0.389 and click OK.\n" );
printf( "Move the cursor over one of the 3 points (at .387, .388, .389).\n" );
printf( "Press down the left mouse button.\n" );
printf( "When I do it, there are 6 extra boxes drawn\n" );
printf( " (in addition to the three that should be drawn)\n" );
printf( "===============================================================\n" );
}