edit text on contour plot

Hi I have a contour plot with two sets of contour lines and the label of the value on each of the contour lines. does anyone know how to edit these labels as I want to add the unit of each value? For some reason when I manually edit the plot I can only do this for one set of contours not the second set.

thank you

Answer 1

[dpb]

Use the return value functional form

[C, H] = contour(...) returns contour matrix C as described in
  CONTOURC and a handle H to a contourgroup object.  This handle can
  be used as input to CLABEL.

[Andrew Alkiviades]

thanks so that means

A = contour(cost)

h = ['test1','test2','test3']

 clabel(A,h,'FontSize',15,'LabelSpacing',3000)

?

[dpb]

No, the handle referred to is the optional second return value H which you didn't return...you returned the contour matrix C in A

[Andrew Alkiviades]

thanks im not sure i follow (im new to this!) didnt I return the text strings in "h" with: clabel(A,h...)? if not how do i do that?