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|     Style MSB     |     Style LSB     |
|15               9 |       4        1 0|
...
bits 5-9 = Structure (0-31)
bits 10-15 = Reserved (locked to value of 0)

posture=2 (10)
app_width=5  (101)
...
000000 00110 101 10
or, without the spaces:
0000000011010110

my $style_word=pack(b2 b3 b5 b6),$pos,$aw,$stru,0;