/usr/include/X11/bitmaps/rdblarrow is in x11-apps 7.7+6ubuntu1.
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 | #define next_width 11
#define next_height 11
static char next_bits[] = {
0x21, 0x00, 0x42, 0x00, 0x84, 0x00, 0x08, 0x01, 0x10, 0x02, 0x20, 0x04,
0x10, 0x02, 0x08, 0x01, 0x84, 0x00, 0x42, 0x00, 0x21, 0x00};
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