$ fq -d tcp_segment dv tcp_segment_sack
    |00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|.{}: tcp_segment_sack (tcp_segment) 0x0-0x2b.7 (44)
0x00|e5 c0                                          |..              |  source_port: 58816 0x0-0x1.7 (2)
0x00|      00 50                                    |  .P            |  destination_port: "http" (80) (World Wide Web HTTP) 0x2-0x3.7 (2)
0x00|            e5 94 3f 77                        |    ..?w        |  sequence_number: 3851698039 0x4-0x7.7 (4)
0x00|                        a3 c4 c4 80            |        ....    |  acknowledgment_number: 2747581568 0x8-0xb.7 (4)
0x00|                                    b0         |            .   |  data_offset: 11 0xc-0xc.3 (0.4)
0x00|                                    b0         |            .   |  reserved: 0 0xc.4-0xc.6 (0.3)
0x00|                                    b0         |            .   |  ns: false 0xc.7-0xc.7 (0.1)
0x00|                                       10      |             .  |  cwr: false 0xd-0xd (0.1)
0x00|                                       10      |             .  |  ece: false 0xd.1-0xd.1 (0.1)
0x00|                                       10      |             .  |  urg: false 0xd.2-0xd.2 (0.1)
0x00|                                       10      |             .  |  ack: true 0xd.3-0xd.3 (0.1)
0x00|                                       10      |             .  |  psh: false 0xd.4-0xd.4 (0.1)
0x00|                                       10      |             .  |  rst: false 0xd.5-0xd.5 (0.1)
0x00|                                       10      |             .  |  syn: false 0xd.6-0xd.6 (0.1)
0x00|                                       10      |             .  |  fin: false 0xd.7-0xd.7 (0.1)
0x00|                                          01 3e|              .>|  window_size: 318 0xe-0xf.7 (2)
0x10|34 b6                                          |4.              |  checksum: 0x34b6 0x10-0x11.7 (2)
0x10|      00 00                                    |  ..            |  urgent_pointer: 0 0x12-0x13.7 (2)
    |                                               |                |  options[0:6]: 0x14-0x2b.7 (24)
    |                                               |                |    [0]{}: option 0x14-0x14.7 (1)
0x10|            01                                 |    .           |      kind: "nop" (1) (No operation) 0x14-0x14.7 (1)
    |                                               |                |    [1]{}: option 0x15-0x15.7 (1)
0x10|               01                              |     .          |      kind: "nop" (1) (No operation) 0x15-0x15.7 (1)
    |                                               |                |    [2]{}: option 0x16-0x1f.7 (10)
0x10|                  08                           |      .         |      kind: "timestamp" (8) (Timestamp and echo of previous timestamp) 0x16-0x16.7 (1)
0x10|                     0a                        |       .        |      length: 10 0x17-0x17.7 (1)
0x10|                        00 17 95 6f            |        ...o    |      value: 1545583 0x18-0x1b.7 (4)
0x10|                                    8d 9d 9e 27|            ...'|      echo_reply: 2375917095 0x1c-0x1f.7 (4)
    |                                               |                |    [3]{}: option 0x20-0x20.7 (1)
0x20|01                                             |.               |      kind: "nop" (1) (No operation) 0x20-0x20.7 (1)
    |                                               |                |    [4]{}: option 0x21-0x21.7 (1)
0x20|   01                                          | .              |      kind: "nop" (1) (No operation) 0x21-0x21.7 (1)
    |                                               |                |    [5]{}: option 0x22-0x2b.7 (10)
0x20|      05                                       |  .             |      kind: "sack" (5) (Selective Acknowledgement) 0x22-0x22.7 (1)
0x20|         0a                                    |   .            |      length: 10 0x23-0x23.7 (1)
    |                                               |                |      blocks[0:1]: 0x24-0x2b.7 (8)
    |                                               |                |        [0]{}: block 0x24-0x2b.7 (8)
0x20|            a3 c4 ca 28                        |    ...(        |          left_edge: 2747583016 0x24-0x27.7 (4)
0x20|                        a3 c4 cf d0|           |        ....|   |          right_edge: 2747584464 0x28-0x2b.7 (4)
    |                                               |                |  payload: raw bits 0x2c-NA (0)