/usr/share/blt2.4/demos/bitmaps/fish/rightm.xbm is in blt-demo 2.4z-7ubuntu2.
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_rightm_width 16
#define fc_rightm_height 16
#define fc_rightm_x_hot 8
#define fc_rightm_y_hot 8
static char fc_rightm_bits[] = {
0x00, 0x00, 0x00, 0x00, 0xf0, 0x00, 0xe0, 0x03, 0xc1, 0x0f, 0xc7, 0x3f,
0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xc7, 0x3f,
0xc1, 0x0f, 0xc0, 0x01, 0xe0, 0x00, 0x00, 0x00};
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