logarithmic scales

Hi guys,
I'm using a logarithmic scale defined by this function

Code:

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setAxisScaleEngine(xBottom, new QwtLog10ScaleEngine);

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but this can't regroup the values in the axis like this example:

http://img228.imageshack.us/img228/8/snap3ql.jpg

any idea how to do this ?

Also setting the right values for the scale ?

Code:

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setAxisScale( QwtPlot::xBottom, 1e4, 2 * 1e6 );

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Maybe you also want to implement your own QwtScaleDraw object for returning richtext tick labels with superscripts ( or use the mathml textengine of Qwt 6 ).

Uwe

Thanks Uwe,
i have any idea how to do this :( please can u forgive me an example.