In this file, the CDP numbers are in byte 21-24 of the trace header - but the shot points are not recorded - an expression has to be entered

REEL HEADER

C 1 OWNER: AUSTRALIAN BUREAU OF MINERAL RESOURCES (BMR)
C 2 LINE: BMR-21A AREA: PRYDZ BAY, ANTARCTICA
C 3 YEAR COLLECTED: 1982 VESSEL: M.V. NELLA DAN
C 4 SAMPLE INTERVAL: 4 MSEC SAMPLES/TRACE: 1750
C 5 TRACE INTERVAL: 25 METERS TIME RANGE: 0 TO 7 SECONDS
C 6 SHOTPOINT RANGE: 100 TO 2730 TOTAL TRACES: 2631
C 7
C 8 SHOTPOINT VALUES LOCATED IN TRACE HEADER BYTES 189-190 (INTEGER)
C 9 **************************************************************************
C10
C11 THESE DATA ARE DISTRIBUTED ON CD-ROM UNDER THE AUSPICES OF THE SCIENTIFIC
C12 COMMITTEE ON ANTARCTIC RESEARCH (SCAR), SUBJECT TO GUIDELINES ESTABLISHED
C13 FOR USE WITHIN THE ANTARCTIC SEISMIC DATA LIBRARY SYSTEM FOR COOPERATIVE
C14 RESEARCH (SDLS), ADOPTED IN ANTARCTIC TREATY CONSULTATIVE MEETING RECOM-
C15 MENDATION XVI-12. DISTRIBUTION OR PUBLICATION OF THESE DATA WITHOUT THE
C16 EXPRESS CONSENT OF THE OWNER, AUSTRALIAN BUREAU OF MINERAL RESOURCES
C17 (BMR), IS PROHIBITED. DATA ON THIS CD-ROM ARE INTENDED FOR THE EXCLUSIVE
C18 USE OF THE ANTARCTIC SCIENTIFIC COMMUNITY FOR COOPERATIVE RESEARCH
C19 WITH THE DATA OWNER. THESE DATA SHOULD NOT BE TRANSFERRED OR COPIED
C20 FOR USE OUTSIDE THE SDLS BRANCHES. AFTER 1995, THESE DATA WILL BE AVAIL-
C21 ABLE FOR UNRESTRICTED USE THROUGH THE WORLD DATA CENTER OR DIRECTLY
C22 FROM BMR.
C23
C24 FOR FURTHER GUIDELINES AND DISCUSSION REGARDING THE USE OF SDLS DATA,
C25 PLEASE REFER TO: "A SCAR SEISMIC DATA LIBRARY SYSTEM FOR COOPERATIVE
C26 RESEARCH", SCAR REPORT, SCOTT POLAR RESEARCH INSTITUTE, CAMBRIDGE,
C27 ENGLAND, IN PRESS
C28
C29 QUESTIONS REGARDING THIS DATASET, AND REQUESTS FOR PERMISSION TO USE
C30 THESE DATA FOR COOPERATIVE RESEARCH PURPOSES SHOULD BE ADDRESSED TO:
C31 MR. HOWARD STAGG
C32 DIV. OF MARINE GEOSCIENCES, BUREAU OF MINERAL RESOURCES
C33 GPO BOX 378, CANBERRA, AUSTRALIA
C34
C35 FOR FURTHER INFORMATION CONCERNING THE ANTARCTIC SEISMIC DATA LIBRARY
C36 SYSTEM, PLEASE CONTACT:
C37 JON CHILDS OR ALAN COOPER
C38 U. S. GEOLOGICAL SURVEY, M/S 999
C39 345 MIDDLEFIELD RD., MENLO PARK, CALIFORNIA 94025 USA
C40 **************************************************************************

Reel Identification Header - Binary Coded Block

--------------------------------------------------------------------------------
Job ID: 0
Line number: 0
Reel number: 1
Data traces per record: 1
Aux. traces per record: 0
Tape smpl interval(us): 4000
Field smpl interval(us): 0
Samples per trace: 1750
Field samples per trace: 0
Data sample format code: 1
CDP fold: 1
Trace sorting code: 0
Vertical sum code: 0
Start sweep frequency: 0
End sweep frequency: 0
Sweep length: 0
Sweep type: 0
Sweep trace: 0
Start taper: 0
End taper: 0
Taper type: 0
Correlated: 0
Gain recovered: 0
Amplitude recovery: 0
Measurement system: 1
Polarity: 0
Vibratory polarity: 0

Trace header parameters specified by location and format:
CDP: 9.000 <- CDP recorded
Shot point: 0.000 <- SP not recorded
TFS: 0.000
Station location X/lon: 425.000
Station location Y/lat: 0.000

1-4 Trace number line : 1
5-8 Trace number reel : 1
9-12 Field record number: 100
13-16 Field trace number: 6
17-20 Energy source point: 0
21-24 CDP ensemble: 9
25-28 CDP trace number : 1
29-30 Trace ID code: 1
31-32 Num. vert. summed traces: 0
33-34 Num. horiz. stacked traces: 1
35-36 Data use: 0
37-40 Source/Rcvr distance: -425
41-44 Rcvr group elevation: 0
45-48 Source elevation: 0
49-52 Source depth: 0
53-56 Datum elev at receiver 0
57-60 Datum elev at source: 0
61-64 Water depth at source: 0
65-68 Water depth at group: 0
69-70 Depth scalar: 0
71-72 Coordinate scalar: 0
73-76 Source coordinate x: 425
77-80 Source coordinate y: 0
81-84 Group coordinate x: 0
85-88 Group coordinate y: 0
89-90 Coordinate units: 0
91-92 Weathering velocity: 0
93-94 Subweathering velocity: 0
95-96 Uphole time at source: 0
97-98 Uphole time at group: 0
99-100 Source static correction: 0
101-102 Group static correction: 0
103-104 Total static applied: 0
105-106 Lag time a: 0
107-108 Lag time b: 0
109-110 Delay recording time: 0
111-112 Mute start: 0
113-114 Mute end: 0
115-116 Number of samples: 1750
117-118 Sample interval(us): 4000
4-byte Integers in words 31-60
0 0 0 0 0
0 0 0 0 33
458783 2883584 0 0 0
9 1179649 6553600 0 0
0 0 0 0 0
0 0 0 0 0

--------------------------------------------------------------------------------
+0.00 : +0.0000000E+00 +0.0000000E+00 +0.0000000E+00 +0.0000000E+00
+16.00 : +0.0000000E+00 +0.0000000E+00 +0.0000000E+00 +0.0000000E+00
+32.00 : +0.0000000E+00 -9.2843625E+04 -9.2843625E+04 -9.2843625E+04
+48.00 : -9.2843625E+04 -9.2843625E+04 -9.2843625E+04 +0.0000000E+00

[more trace data]

+6944.00 : -1.7121360E+07 -4.7685136E+07 -2.4762304E+07 -1.0400168E+08
+6960.00 : -1.4220645E+08 -7.4286944E+07 -8.2069350E+06 +7.9946912E+07
+6976.00 : +7.4145440E+07 +7.5418944E+07 +9.3247808E+07 +1.1602914E+08
+6992.00 : +9.9756736E+07 -2.1366336E+07

--------------------------------------------------------------------------------
Trace header parameters specified by location and format:
CDP: 10.000
Shot point: 0.000
TFS: 0.000
Station location X/lon: 437.000
Station location Y/lat: 0.000
1-4 Trace number line : 2
5-8 Trace number reel : 2
9-12 Field record number: 101
13-16 Field trace number: 5
17-20 Energy source point: 0
21-24 CDP ensemble: 10
25-28 CDP trace number : 1
29-30 Trace ID code: 1
31-32 Num. vert. summed traces: 0
33-34 Num. horiz. stacked traces: 2
35-36 Data use: 0
37-40 Source/Rcvr distance: -375
41-44 Rcvr group elevation: 0
45-48 Source elevation: 0
49-52 Source depth: 0
53-56 Datum elev at receiver 0
57-60 Datum elev at source: 0
61-64 Water depth at source: 0
65-68 Water depth at group: 0
69-70 Depth scalar: 0
71-72 Coordinate scalar: 0
73-76 Source coordinate x: 437
77-80 Source coordinate y: 0
81-84 Group coordinate x: 37
85-88 Group coordinate y: 0
89-90 Coordinate units: 0
91-92 Weathering velocity: 0
93-94 Subweathering velocity: 0
95-96 Uphole time at source: 0
97-98 Uphole time at group: 0
99-100 Source static correction: 0
101-102 Group static correction: 0
103-104 Total static applied: 0
105-106 Lag time a: 0
107-108 Lag time b: 0
109-110 Delay recording time: 0
111-112 Mute start: 0
113-114 Mute end: 0
115-116 Number of samples: 1750
117-118 Sample interval(us): 4000
4-byte Integers in words 31-60
0 0 0 0 0
0 0 0 0 33
458783 3473408 0 0 0
10 1179651 6619136 0 0
0 0 0 0 0
0 0 0 0 0
--------------------------------------------------------------------------------
+0.00 : +0.0000000E+00 +0.0000000E+00 +0.0000000E+00 +0.0000000E+00
+16.00 : +0.0000000E+00 +0.0000000E+00 +0.0000000E+00 +0.0000000E+00

[more trace data]
+6976.00 : +1.5549426E+14 +1.5816499E+14 +1.9555483E+14 +2.4333073E+14
+6992.00 : +2.0920504E+14 -1.1202114E+13
--------------------------------------------------------------------------------

Trace header parameters specified by location and format:

CDP: 11.000
Shot point: 0.000
TFS: 0.000
Station location X/lon: 450.000
Station location Y/lat: 0.000
[etc etc]

Segy dump completed
Traces read and dumped: 4