Ygor,
What I mean is that the data I have is based on the example I gave repeated many times like and I don't think your test works because I get no values for OTH sometimes.
Below is a longer example
TEXT HEADER:
C01 SURVEY : 1994 HE94 2D SEISMIC SURVEY
C02 LINE: HE94-140 PERMIT: WA-252/255-P DIRECTION: 123 DEGREES
C03
C04 RAW STACK
C05
C06 PROCESSING PARAMETERS: PROCESSING LENGTH(SEC): 8 SAMPLE PERIOD(MS): 4
C07
C08 TRANSCRIPTION: SEGD INTO SPT'S INTERNAL FORMAT
C09 GAIN RECOVERY
C10 INSTRUMENT DEPHASE
C11 RESAMPLE FROM 2 MS TO 4 MS
C12 FREE FORM DESIGN F-K FILTER (ACCEPT)
C13 ARRAY SIMULATION AND TRACE DECIMATION (ALTERNATE TRACE OUTPUT)
C14 CDP GATHER (100 FOLD INTERVAL = 12.5M)
C15 VELOCITY ANALYSIS:
C16 RADON MULTIPLE ATTENUATION
C17 D.M.O.: 100 OFFSET PLANES
C18 D.B.S.: 2 OPERATORS: 16 AND 16 MS GAP
C19 VELOCITY ANALYSIS: OMNIVELS PICKED WORKSTATION CHECKED
C20 SPHERICAL DIVERGENCE CORRECTION (FOLLOWING REMOVAL OF INITIAL GAIN)
C21 NMO CORRECTION
C22 PRE STACK SCALING (SINGLE WINDOW PER TRACE)
C23 MUTE: INNER AND OUTER TRACE.
C24 STACK:
C25 BULK STATIC CORRECTION: 10 MS
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35 HE94-140 CDP 205 == SP 1001
C36 HE94-140 CDP 405 == SP 1101
C37
C38
C39
C40 CDPS 1 TO 9944 SPS 1001 TO 5873
BINARY HEADER:
job_id_number = 0
line_number = 1
reel_number = 1
traces_per_record = 200
aux_traces_per_record = 0
sample_interval = 4000
original_sample_interval = 0
samples_per_trace = 2000
original_samples_per_trace = 0
format_code = 1
CDP_fold = 100
trace_sorting_code = 0
vertical_sum_code = 0
start_sweep_frequency = 0
end_sweep_frequency = 0
sweep_length = 0
sweep_type = 0
sweep_channel_trace = 0
start_sweep_taper_length = 0
end_sweep_taper_length = 0
taper_type = 0
correlated_data_traces = 0
bin_gain_recovered = 0
ampl_recovery_method = 0
measurement_system = 0
polarity = 0
vib_polarity_code = 0
FILE INFORMATION:
segy file name = /asi/def/utilisateurs/chea/HE94/HE94-140_Raw_Stack.sgy
no template file selected
line name = HE94-140
number of traces = 9944
trace header length = 240
number of samples = 2000
start time = 0 msec
end time = 7996 msec
sample rate = 4 msec
sample format = 1 (IBM Real)
trace number extracted from byte number 1, format Integer 4-Byte
first trace number = 1
last trace number = 9944
trace number increment = 1
shotpoint number extracted from byte number 21, format Integer 4-Byte
first shotpoint = 1
last shotpoint = 9944
shotpoint increment = 1
x coordinate extracted from byte number 73, format Integer 4-Byte
first x coordinate = 0.00
last x coordinate = 0.00
y coordinate extracted from byte number 77, format Integer 4-Byte
first y coordinate = 0.00
last y coordinate = 0.00
3D line number extracted from byte number 9, format Integer 4-Byte
smallest 3D line value = 0
largest 3D line value = 0
3D trace number extracted from byte number 21, format Integer 4-Byte
smallest 3D trace value = 1
largest 3D trace value = 9944
minimum amplitude in file = -73912.6
maximum amplitude in file = 123870
********************************************************************************
TEXT HEADER:
C01 SURVEY : 1994 HE94 2D SEISMIC SURVEY
C02 LINE: HE94-142 PERMIT: WA-252/255-P DIRECTION: 123 DEGREES
C03
C04 RAW STACK
C05
C06 PROCESSING PARAMETERS: PROCESSING LENGTH(SEC): 8 SAMPLE PERIOD(MS): 4
C07
C08 TRANSCRIPTION: SEGD INTO SPT'S INTERNAL FORMAT
C09 GAIN RECOVERY
C10 INSTRUMENT DEPHASE
C11 RESAMPLE FROM 2 MS TO 4 MS
C12 FREE FORM DESIGN F-K FILTER (ACCEPT)
C13 ARRAY SIMULATION AND TRACE DECIMATION (ALTERNATE TRACE OUTPUT)
C14 CDP GATHER (100 FOLD INTERVAL = 12.5M)
C15 VELOCITY ANALYSIS:
C16 RADON MULTIPLE ATTENUATION
C17 D.M.O.: 100 OFFSET PLANES
C18 D.B.S.: 2 OPERATORS: 16 AND 16 MS GAP
C19 VELOCITY ANALYSIS: OMNIVELS PICKED WORKSTATION CHECKED
C20 SPHERICAL DIVERGENCE CORRECTION (FOLLOWING REMOVAL OF INITIAL GAIN)
C21 NMO CORRECTION
C22 PRE STACK SCALING (SINGLE WINDOW PER TRACE)
C23 MUTE: INNER AND OUTER TRACE.
C24 STACK:
C25 BULK STATIC CORRECTION: 10 MS
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35 HE94-142 CDP 205 == SP 1001
C36 HE94-142 CDP 405 == SP 1101
C37
C38
C39
C40 CDPS 1 TO 7140 SPS 1001 TO 4471
BINARY HEADER:
job_id_number = 0
line_number = 2
reel_number = 1
traces_per_record = 200
aux_traces_per_record = 0
sample_interval = 4000
original_sample_interval = 0
samples_per_trace = 2000
original_samples_per_trace = 0
format_code = 1
CDP_fold = 100
trace_sorting_code = 0
vertical_sum_code = 0
start_sweep_frequency = 0
end_sweep_frequency = 0
sweep_length = 0
sweep_type = 0
sweep_channel_trace = 0
start_sweep_taper_length = 0
end_sweep_taper_length = 0
taper_type = 0
correlated_data_traces = 0
bin_gain_recovered = 0
ampl_recovery_method = 0
measurement_system = 0
polarity = 0
vib_polarity_code = 0
FILE INFORMATION:
segy file name = /asi/def/utilisateurs/chea/HE94/HE94-142_Raw_Stack.sgy
no template file selected
line name = HE94-142
number of traces = 7140
trace header length = 240
number of samples = 2000
start time = 0 msec
end time = 7996 msec
sample rate = 4 msec
sample format = 1 (IBM Real)
trace number extracted from byte number 1, format Integer 4-Byte
first trace number = 1
last trace number = 7140
trace number increment = 1
shotpoint number extracted from byte number 21, format Integer 4-Byte
first shotpoint = 1
last shotpoint = 7140
shotpoint increment = 1
x coordinate extracted from byte number 73, format Integer 4-Byte
first x coordinate = 0.00
last x coordinate = 0.00
y coordinate extracted from byte number 77, format Integer 4-Byte
first y coordinate = 0.00
last y coordinate = 0.00
3D line number extracted from byte number 9, format Integer 4-Byte
smallest 3D line value = 1001
largest 3D line value = 4471
3D trace number extracted from byte number 21, format Integer 4-Byte
smallest 3D trace value = 1
largest 3D trace value = 7140
minimum amplitude in file = -62929.9
maximum amplitude in file = 108822
********************************************************************************
TEXT HEADER:
C01 SURVEY : 1994 HE94 2D SEISMIC SURVEY
C02 LINE: HE94-144 PERMIT: WA-252/255-P DIRECTION: 304 DEGREES
C03
C04 RAW STACK
C05
C06 PROCESSING PARAMETERS: PROCESSING LENGTH(SEC): 8 SAMPLE PERIOD(MS): 4
C07
C08 TRANSCRIPTION: SEGD INTO SPT'S INTERNAL FORMAT
C09 GAIN RECOVERY
C10 INSTRUMENT DEPHASE
C11 RESAMPLE FROM 2 MS TO 4 MS
C12 FREE FORM DESIGN F-K FILTER (ACCEPT)
C13 ARRAY SIMULATION AND TRACE DECIMATION (ALTERNATE TRACE OUTPUT)
C14 CDP GATHER (100 FOLD INTERVAL = 12.5M)
C15 VELOCITY ANALYSIS:
C16 RADON MULTIPLE ATTENUATION
C17 D.M.O.: 100 OFFSET PLANES
C18 D.B.S.: 2 OPERATORS: 16 AND 16 MS GAP
C19 VELOCITY ANALYSIS: OMNIVELS PICKED WORKSTATION CHECKED
C20 SPHERICAL DIVERGENCE CORRECTION (FOLLOWING REMOVAL OF INITIAL GAIN)
C21 NMO CORRECTION
C22 PRE STACK SCALING (SINGLE WINDOW PER TRACE)
C23 MUTE: INNER AND OUTER TRACE.
C24 STACK:
C25 BULK STATIC CORRECTION: 10 MS
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35 HE94-144 CDP 205 == SP 5925
C36 HE94-144 CDP 405 == SP 5825
C37
C38
C39
C40 CDPS 1 TO 10236 SPS 5925 TO 907
BINARY HEADER:
job_id_number = 0
line_number = 3
reel_number = 1
traces_per_record = 200
aux_traces_per_record = 0
sample_interval = 4000
original_sample_interval = 0
samples_per_trace = 2000
original_samples_per_trace = 0
format_code = 1
CDP_fold = 100
trace_sorting_code = 0
vertical_sum_code = 0
start_sweep_frequency = 0
end_sweep_frequency = 0
sweep_length = 0
sweep_type = 0
sweep_channel_trace = 0
start_sweep_taper_length = 0
end_sweep_taper_length = 0
taper_type = 0
correlated_data_traces = 0
bin_gain_recovered = 0
ampl_recovery_method = 0
measurement_system = 0
polarity = 0
vib_polarity_code = 0
FILE INFORMATION:
segy file name = /asi/def/utilisateurs/chea/HE94/HE94-144_Raw_Stack.sgy
no template file selected
line name = HE94-144
number of traces = 10206
trace header length = 240
number of samples = 2000
start time = 0 msec
end time = 7996 msec
sample rate = 4 msec
sample format = 1 (IBM Real)
trace number extracted from byte number 1, format Integer 4-Byte
first trace number = 1
last trace number = 10236
trace number increment = 1
shotpoint number extracted from byte number 21, format Integer 4-Byte
first shotpoint = 1
last shotpoint = 10236
shotpoint increment = 1
x coordinate extracted from byte number 73, format Integer 4-Byte
first x coordinate = 0.00
last x coordinate = 0.00
y coordinate extracted from byte number 77, format Integer 4-Byte
first y coordinate = 0.00
last y coordinate = 0.00
3D line number extracted from byte number 9, format Integer 4-Byte
smallest 3D line value = 0
largest 3D line value = 0
3D trace number extracted from byte number 21, format Integer 4-Byte
smallest 3D trace value = 1
largest 3D trace value = 10236
minimum amplitude in file = -100820
maximum amplitude in file = 122087
********************************************************************************
TEXT HEADER:
C01 SURVEY : 1994 HE94 2D SEISMIC SURVEY
C02 LINE: HE94-146 PERMIT: WA-252/255-P DIRECTION: 304 DEGREES
C03
C04 RAW STACK
C05
C06 PROCESSING PARAMETERS: PROCESSING LENGTH(SEC): 8 SAMPLE PERIOD(MS): 4
C07
C08 TRANSCRIPTION: SEGD INTO SPT'S INTERNAL FORMAT
C09 GAIN RECOVERY
C10 INSTRUMENT DEPHASE
C11 RESAMPLE FROM 2 MS TO 4 MS
C12 FREE FORM DESIGN F-K FILTER (ACCEPT)
C13 ARRAY SIMULATION AND TRACE DECIMATION (ALTERNATE TRACE OUTPUT)
C14 CDP GATHER (100 FOLD INTERVAL = 12.5M)
C15 VELOCITY ANALYSIS:
C16 RADON MULTIPLE ATTENUATION
C17 D.M.O.: 100 OFFSET PLANES
C18 D.B.S.: 2 OPERATORS: 16 AND 16 MS GAP
C19 VELOCITY ANALYSIS: OMNIVELS PICKED WORKSTATION CHECKED
C20 SPHERICAL DIVERGENCE CORRECTION (FOLLOWING REMOVAL OF INITIAL GAIN)
C21 NMO CORRECTION
C22 PRE STACK SCALING (SINGLE WINDOW PER TRACE)
C23 MUTE: INNER AND OUTER TRACE.
C24 STACK:
C25 BULK STATIC CORRECTION: 10 MS
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35 HE94-146 CDP 205 == SP 4627
C36 HE94-146 CDP 405 == SP 4527
C37
C38
C39
C40 CDPS 1 TO 7640 SPS 4627 TO 907
BINARY HEADER:
job_id_number = 0
line_number = 4
reel_number = 1
traces_per_record = 200
aux_traces_per_record = 0
sample_interval = 4000
original_sample_interval = 0
samples_per_trace = 2000
original_samples_per_trace = 0
format_code = 1
CDP_fold = 100
trace_sorting_code = 0
vertical_sum_code = 0
start_sweep_frequency = 0
end_sweep_frequency = 0
sweep_length = 0
sweep_type = 0
sweep_channel_trace = 0
start_sweep_taper_length = 0
end_sweep_taper_length = 0
taper_type = 0
correlated_data_traces = 0
bin_gain_recovered = 0
ampl_recovery_method = 0
measurement_system = 0
polarity = 0
vib_polarity_code = 0
FILE INFORMATION:
segy file name = /asi/def/utilisateurs/chea/HE94/HE94-146_Raw_Stack.sgy
no template file selected
line name = HE94-146
number of traces = 7640
trace header length = 240
number of samples = 2000
start time = 0 msec
end time = 7996 msec
sample rate = 4 msec
sample format = 1 (IBM Real)
trace number extracted from byte number 1, format Integer 4-Byte
first trace number = 1
last trace number = 7640
trace number increment = 1
shotpoint number extracted from byte number 21, format Integer 4-Byte
first shotpoint = 1
last shotpoint = 7640
shotpoint increment = 1
x coordinate extracted from byte number 73, format Integer 4-Byte
first x coordinate = 0.00
last x coordinate = 0.00
y coordinate extracted from byte number 77, format Integer 4-Byte
first y coordinate = 0.00
last y coordinate = 0.00
3D line number extracted from byte number 9, format Integer 4-Byte
smallest 3D line value = 907
largest 3D line value = 4627
3D trace number extracted from byte number 21, format Integer 4-Byte
smallest 3D trace value = 1
largest 3D trace value = 7640
minimum amplitude in file = -21117
maximum amplitude in file = 26109.7
********************************************************************************
TEXT HEADER:
C01 SURVEY : 1994 HE94 2D SEISMIC SURVEY
C02 LINE: HE94-148 PERMIT: WA-252/255-P DIRECTION: 303 DEGREES
C03
C04 RAW STACK
C05
C06 PROCESSING PARAMETERS: PROCESSING LENGTH(SEC): 8 SAMPLE PERIOD(MS): 4
C07
C08 TRANSCRIPTION: SEGD INTO SPT'S INTERNAL FORMAT
C09 GAIN RECOVERY
C10 INSTRUMENT DEPHASE
C11 RESAMPLE FROM 2 MS TO 4 MS
C12 FREE FORM DESIGN F-K FILTER (ACCEPT)
C13 ARRAY SIMULATION AND TRACE DECIMATION (ALTERNATE TRACE OUTPUT)
C14 CDP GATHER (100 FOLD INTERVAL = 12.5M)
C15 VELOCITY ANALYSIS:
C16 RADON MULTIPLE ATTENUATION
C17 D.M.O.: 100 OFFSET PLANES
C18 D.B.S.: 2 OPERATORS: 16 AND 16 MS GAP
C19 VELOCITY ANALYSIS: OMNIVELS PICKED WORKSTATION CHECKED
C20 SPHERICAL DIVERGENCE CORRECTION (FOLLOWING REMOVAL OF INITIAL GAIN)
C21 NMO CORRECTION
C22 PRE STACK SCALING (SINGLE WINDOW PER TRACE)
C23 MUTE: INNER AND OUTER TRACE.
C24 STACK:
C25 BULK STATIC CORRECTION: 10 MS
C26
C27
C28
C29
C30
C31
C32
C33
C34
C35 HE94-148 CDP 205 == SP 3143
C36 HE94-148 CDP 405 == SP 3043
C37
C38
C39
C40 CDPS 1 TO 4672 SPS 3143 TO 907
BINARY HEADER:
job_id_number = 0
line_number = 5
reel_number = 1
traces_per_record = 200
aux_traces_per_record = 0
sample_interval = 4000
original_sample_interval = 0
samples_per_trace = 2000
original_samples_per_trace = 0
format_code = 1
CDP_fold = 100
trace_sorting_code = 0
vertical_sum_code = 0
start_sweep_frequency = 0
end_sweep_frequency = 0
sweep_length = 0
sweep_type = 0
sweep_channel_trace = 0
start_sweep_taper_length = 0
end_sweep_taper_length = 0
taper_type = 0
correlated_data_traces = 0
bin_gain_recovered = 0
ampl_recovery_method = 0
measurement_system = 0
polarity = 0
vib_polarity_code = 0
FILE INFORMATION:
segy file name = /asi/def/utilisateurs/chea/HE94/HE94-148_Raw_Stack.sgy
no template file selected
line name = HE94-148
number of traces = 4672
trace header length = 240
number of samples = 2000
start time = 0 msec
end time = 7996 msec
sample rate = 4 msec
sample format = 1 (IBM Real)
trace number extracted from byte number 1, format Integer 4-Byte
first trace number = 1
last trace number = 4672
trace number increment = 1
shotpoint number extracted from byte number 21, format Integer 4-Byte
first shotpoint = 1
last shotpoint = 4672
shotpoint increment = 1
x coordinate extracted from byte number 73, format Integer 4-Byte
first x coordinate = 0.00
last x coordinate = 0.00
y coordinate extracted from byte number 77, format Integer 4-Byte
first y coordinate = 0.00
last y coordinate = 0.00
3D line number extracted from byte number 9, format Integer 4-Byte
smallest 3D line value = 0
largest 3D line value = 3143
3D trace number extracted from byte number 21, format Integer 4-Byte
smallest 3D trace value = 1
largest 3D trace value = 4672
minimum amplitude in file = -58102.5
maximum amplitude in file = 95030.1
********************************************************************************