Gorka,
I understand. I don't think it's possible. Does anyone else have any thoughts?
You want the temperature 'streamlines'.
Each of these streamlines can start from an arbitrary point on the vertical heat input line. At the vertical heat input line they must be vectors normal to the vertical line.
These streamlines are normal to the iso-temperature contours shown below :
The vector plot and this is as close as we get.
But also, there is no way to output the curves as useful geometry.
It would be possible to write code to look at the results files and create output a table of x-y values for a datum point array to create datum curves.
Have a good weekend