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<font size="-1">Hello,<br>
<br>
<font size="-1">I am trying to vary thermal expansivity and
diffusivity linearly between the CMB and the surface. Any idea
on how to implement this? <br>
<br>
<font size="-1">Thank you,<br>
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<font size="-1">-<font size="-1">Robert</font></font><br>
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