Hello,

I would like to know the code to create a graph (lines) with the y values (in this case "diff12") in another color (for example in red) when y<0,
I send the example of the data below:

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input int year float diff12
1995  .5012169
1995  .5012169
1995  .5012169
1995  .5012169
1995  .5012169
1995  .5012169
1995  .5012169
1995  .5012169
1996         .
1997         .
1997         .
1997         .
1997         .
1998         .
1999   .832201
1999   .832201
1999   .832201
1999   .832201
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2000 -.3124819
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2003  .4381542
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2004  -.623652
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2005 -.4752033
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2006 -.2263384
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
2007 -1.281406
end
format %ty year
Thank you in advance.