Routines where the raw sndg array is used in the xwvid* files:

xwvid6:
position_cursor
redraw_sounding
processuserdata
load_sounding

xwvid5:
visual1
plot_thetae

xwvid3:
show_moisture
show_shear
show_posnegareas
best_guess_ptype
main_thermo

xwvid2:
grab_level
skewt_cursor_data
get_level_pointer

xwvid1:
draw_skewt
draw_hodo
trace_hodo
trace_temp
trace_temp2
trace_vtmp
trace_dwpt
trace_dwpt2
trace_wetbulb
plot_barbs
plot_barbs2
vvel_profile
trace_dcape

I guess it's fine to expose the data to the various trace routines however
for all of the text generating routines it'd be better to remove it from
there and do the computations in computeparms()