
Example session to make animated GIF from AVL eigenmode plots, for B737 case, 
using ImageMagick "convert" command

1) Create plot.ps with AVL:

% avl b737
MODE
N
X
  click on topmost Dutch-Roll root, roughly at (-0.3,1.9)
  use LRUD keys to rotate airplane for best view of Dutch Roll, e.g. Azim,Elev = -160,15
  play mode by holding down > key, adjust scale with +/- keys as needed, reset time with 0 key
  <space>
G
X
  click on same Dutch Roll root again
  play mode by holding down > key, for whatever length needed
  <space>
<Enter>
Q

2) Edit plot.ps
Globally replace 
 "612    0 translate   90 rotate"
with
 "0 0 translate 0 rotate"
Write new file, e.g. plot2.ps or whatever

3) Create animated GIF:

convert -delay 4 -page 720x500 -border 4x4 plot2.ps plot2.gif

