JPEG Huffman encoder AC0
| HCODE86 | Huffman code 86 8 least significant bits of the Huffman code. If the Huffman code is less than 8 bits long, the unused bits must be 0. |
| HLEN86 | Huffman length 86 Number of bits in the Huffman code HCODE86 minus 1. |
| HCODE87 | Huffman code 87 8 least significant bits of the Huffman code. If the Huffman code is less than 8 bits long, the unused bits must be 0. |
| HLEN87 | Huffman length 87 Number of bits in the Huffman code HCODE87 minus 1. |