18 rows of 16 pixels. The first byte is the row count; the rest are the rows, two bytes each, top down.

The last 4 bytes of it are also the start of the next graphic, at $C23A, which begins inside this one. Both are real: running the game's own drawing code for each sprite reads each range in full. The listing below stops at $C23A so the two blocks do not claim the same bytes, so it is 2 rows short of the 18 this graphic actually has.