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# Pipeline overview
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The LOFAR-VLBI pipeline builds on the output of the LINC pipeline.
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The LOFAR-VLBI pipeline builds on the output of the LINC and (optionally) DDFacet pipelines.
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In particular, it is assumed that LINC has produced sane solution files.
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See the LINC [documentation](https://linc.readthedocs.io/en/latest/) for details on how to run and validate the initial calibration.
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```mermaid
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flowchart TD
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subgraph VLBI
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VLBI1
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end
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subgraph VLBI1[Delay calibration]
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VLBI11
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VLBI12
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VLBI13
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end
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VLBI1[Delay calibration]
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VLBI11[Setup] -->|Clipped data & skymodel| VLBI12[AO flagging & concatenation]
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VLBI12 -->|Grouped subbands| VLBI13[Phaseup]
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VLBI13 -->|Phase-rotated solutions| node3
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node2[LOFAR LTA] -->|target data| VLBI11
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node3[h5parm, output data]
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node1[LINC] -->|Calibrator & target solutions| VLBI11
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```
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### [Delay Calibration](/delay-calibration/README)
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The delay calibration workflow comprises the following steps and subroutines:
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* [Setup](/delay-calibration/setup):
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