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>