yes it is confirm it currently cannot be done http://www.um.es/fem/EjsWiki/index.php/FeedbackEn/00026
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Resolution
    The axes do not allow formatting the ticks. The Format X property refers to the way the coordinates of the point appear (in a yellow box at the lower left corner of the panel) when you click on a point in the panel.
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BTW

I am puzzled by the equation used.

I look at the equation [img]http://upload.wikimedia.org/math/1/0/c/10c96a8f2af7d9631a0f4dde5b817b62.png[/img] and i look at the equation in the XML fT = "h4/((Math.exp(cst/(r*T))-1)*(r*r*r))"

shouldn't fT = "[color=blue]2*h*c*c[/color]/((Math.exp(cst/(r*T))-1)*(r*r*r*[color=blue]r*r[/color]))" ?

strangely i tried to implement the new fT ="[color=blue]2*h*c*c[/color]/((Math.exp(cst/(r*T))-1)*(r*r*r*[color=blue]r*r[/color]))" but the graph is very low and flat and near zero in value.