how to put the isotherm lines on matlab figure
 

Hello CFD Friends,
1/ i have matlab figure's of temperature countour (heat transfer simulation) and i am needing to ways to post-processing it : please could you tell me how to draw on it the isotherm lines , and rescale the axes of the figure (it's 2D)
2/ is there a way to export this figure to origin ????
Thank u very much and have a nice day