Plot

For plotting,
IDL> mfreq=0 $<$CR$>$
IDL> norp_plot,mfreq,file,mvd,tim,fi $<$CR$>$
where mfreq is the index number of the plotting frequency in the array freq.
To overlay another plot
IDL> mfreq1=1 $<$CR$>$
IDL> norp_plot,mfreq1,file,mvd,tim,fi,/over $<$CR$>$
Or by directly; IDL> utplot,tim(where(mvd(mfreq,*))),fi(mfreq,where(mvd(mfreq,*))) $<$CR$>$