/usr/share/blt2.5/demos/bitmaps/fish/midm.xbm is in blt-demo 2.5.3+dfsg-3.
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 6 7 8 | #define fc_midm_width 16
#define fc_midm_height 16
#define fc_midm_x_hot 8
#define fc_midm_y_hot 8
static char fc_midm_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x80, 0x03, 0x80, 0x03, 0xc0, 0x07, 0xe0, 0x0f,
0xe0, 0x0f, 0xe0, 0x0f, 0xe0, 0x0f, 0xe0, 0x0f, 0xe0, 0x0f, 0xe0, 0x0f,
0xc0, 0x07, 0x80, 0x03, 0x80, 0x03, 0x00, 0x00};
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