/usr/share/blt2.4/demos/bitmaps/fish/mid.xbm is in blt-demo 2.4z-4.2ubuntu1.
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_mid_width 16
#define fc_mid_height 16
#define fc_mid_x_hot 8
#define fc_mid_y_hot 8
static char fc_mid_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x80, 0x03, 0x80, 0x03, 0x40, 0x04, 0x20, 0x08,
0xe0, 0x0e, 0xe0, 0x0e, 0x20, 0x08, 0xa0, 0x0b, 0xe0, 0x0f, 0xa0, 0x0b,
0x40, 0x04, 0x80, 0x03, 0x80, 0x03, 0x00, 0x00};
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