/usr/share/xfig/bitmaps/vertical.bmp is in transfig 1:3.2.5.e-4+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | /* vertical lines */
#define vertical_width 8
#define vertical_height 8
static unsigned char vertical_bits[] = {
0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88};
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