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Figure 4: Relative velocity between the
two initial states 1
and 2 as a function of the
pressure at the contact discontinuity.
Note that the curve shown is given by the continuous joining of
three different curves describing the
relative velocity corresponding to two shocks (dashed line), one
shock and one rarefaction wave (dotted
line), and two rarefaction waves (continuous line), respectively.
The joining of the curves is indicated
by filled circles. The small inset on the right shows a
magnification for a smaller range
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