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Floating-point values are displayed using the printf
format "%Lf" but this is the format without exponent
(and with default precision of 6 digit).
However, by its nature, this format is very imprecise.
For example, *all* values smaller than 0.5e-6 are displayed
as "0.000000".
Improve this by using the "%Le" format which always use
an exponent and thus maximize the precision.
Note: ultimately, we should display them exactly, for
example by using "%La", but this will requires C99.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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