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View this ticket online: <a href="https://help.nrao.edu/app#/t/ticket/42419" title="(#)" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">https://help.nrao.edu/app#/tickets/t/42419</a>
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James Miller-Jones <james.miller-jones@curtin.edu.au> </td>
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Awaiting Agent
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Unsupported OS
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Hello, I have been trying to solve for the zenith atmospheric delay dependences and clock errors in my VLBA data set using the AIPS task DELZN, and have encountered a failure mode that...
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<div>Hello,</div><div>I have been trying to solve for the zenith atmospheric delay dependences and clock errors in my VLBA data set using the AIPS task DELZN, and have encountered a failure mode that I have not come across before.</div><div>My data set (BM599A) was run with VLBA+Y1, but antennas 1, 6 and 9 were out of the array. When I tried to run DELZN, it seemed to want to try to fit for a non-existent antenna 12, with the error message:</div><div>LOCALHO> DELZN1: Task DELZN (release of 31DEC26) begins</div><div>LOCALHO> DELZN1: Copied CL file from vol/cno/vers 1 2 9 to 1 2 10</div><div>LOCALHO> DELZN1: Finished init</div><div>LOCALHO> DELZN1: !!!!! center of the data is at 0.12468 !!!!!</div><div>LOCALHO> DELZN1: DLESQR: Insufficient degrees of freedom.</div><div>LOCALHO> DELZN1: Ref ANT 12: FitPar 1 0.000 ( 0.000) mm |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 12: FitPar 2 0.000 ( 0.000) mm/day |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 12: FitPar 3 0.000 ( 0.000) mm |CLOCK</div><div>LOCALHO> DELZN1: Ref ANT 12: FitPar 4 0.000 ( 0.000) mm/day |CLOCK</div><div>LOCALHO> DELZN1: PLTFIT: No data for sources selected</div><div>LOCALHO> DELZN1: Purports to die of UNNATURAL causes</div><div>LOCALHO> DELZN1: localhos 31DEC26 TST: Cpu= 0.0 Real= 0 IO= 3</div><div><br></div><div>I therefore tried to specify only the remaining antennas, via ante 2 3 4 5 7 8 10 11 0, and it then tried to fit for a ninth antenna and again failed:</div><div>LOCALHO> DELZN1: Task DELZN (release of 31DEC26) begins</div><div>LOCALHO> DELZN1: Copied CL file from vol/cno/vers 1 2 9 to 1 2 11</div><div>LOCALHO> DELZN1: Finished init</div><div>LOCALHO> DELZN1: !!!!! center of the data is at 0.12468 !!!!!</div><div>LOCALHO> DELZN1: DLESQR: Insufficient degrees of freedom.</div><div>LOCALHO> DELZN1: Ref ANT 9: FitPar 1 0.000 ( 0.000) mm |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 9: FitPar 2 0.000 ( 0.000) mm/day |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 9: FitPar 3 0.000 ( 0.000) mm |CLOCK</div><div>LOCALHO> DELZN1: Ref ANT 9: FitPar 4 0.000 ( 0.000) mm/day |CLOCK</div><div>LOCALHO> DELZN1: PLTFIT: No data for sources selected</div><div>LOCALHO> DELZN1: Purports to die of UNNATURAL causes</div><div>LOCALHO> DELZN1: localhos 31DEC26 TST: Cpu= 0.0 Real= 0 IO= 3</div><div><br></div><div>If I select only a small subset of antennas, via ante 2 4 5 11 0, it still tries to fit for the (n+1)th antenna and fails:</div><div>LOCALHO> DELZN1: Task DELZN (release of 31DEC26) begins</div><div>LOCALHO> DELZN1: Copied CL file from vol/cno/vers 1 2 9 to 1 2 12</div><div>LOCALHO> DELZN1: Finished init</div><div>LOCALHO> DELZN1: !!!!! center of the data is at 0.12468 !!!!!</div><div>LOCALHO> DELZN1: DLESQR: Insufficient degrees of freedom.</div><div>LOCALHO> DELZN1: Ref ANT 5: FitPar 1 0.000 ( 0.000) mm |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 5: FitPar 2 0.000 ( 0.000) mm/day |ATMOS</div><div>LOCALHO> DELZN1: Ref ANT 5: FitPar 3 0.000 ( 0.000) mm |CLOCK</div><div>LOCALHO> DELZN1: Ref ANT 5: FitPar 4 0.000 ( 0.000) mm/day |CLOCK</div><div>LOCALHO> DELZN1: PLTFIT: No data for sources selected</div><div>LOCALHO> DELZN1: Purports to die of UNNATURAL causes</div><div>LOCALHO> DELZN1: localhos 31DEC26 TST: Cpu= 0.0 Real= 0 IO= 3</div><div><br></div><div>I have tried running SPLAT to retain only the valid antennas and then rerunning DELZN, but to no avail. I have tried setting subarray 1, which also didn't help.</div><div><br></div><div>Any advice you have as to what could be going wrong would be appreciated. I note that I have successfully run DELZN on a different data set on this machine. I am running Mac OS 26 (Tahoe) with ARM architecture.</div><div><br></div><div>Thanks in advance,</div><div><br></div><div>James</div>
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