Pipeline Overview
=================

The flowchart below provides an overview of the main steps in the ICAL (Rapthor) pipeline, including
calibration, prediction, and imaging stages.

.. mermaid::

    flowchart TB
    subgraph Calibrate["Calibrate"]
            ddecal_fast["DDECal: Calibrate fast phases"]
            ddecal_slow["DDECal: Calibrate slow gains (all stations together, optional)"]
            ddecal_slow_separate["DDECal: Calibrate slow gains (each station separately)"]
            process_gains["Process gains: smooth and normalise"]
            solutions_cal["Calibration solutions"]
    end
    subgraph Predict["Predict"]
            dppp["DP3: Predict model visibilities"]
            subtract["Subtract: Subtract model from data"]
            model_vis["Model visibility data"]
            image_vis["Imaging visibility data"]
    end
    subgraph Image["Image"]
            dppp_image["DP3: Phase shift visibilities"]
            image["WSClean: Image using facets or screens"]
            images["Images"]
            sky_models["Sky models"]
    end
        sky_model["Sky model"] --> tessellate["Group: Define DDE calibrators"]
        tessellate --> ddecal_fast
        input_ms["Input visibility data (MS)"] --> ddecal_fast
        ddecal_fast --> ddecal_slow --> ddecal_slow_separate --> process_gains --> solutions_cal
        solutions_cal --> dppp
        dppp --> model_vis
        model_vis --> subtract
        subtract --> image_vis
        image_vis --> dppp_image
        dppp_image --> image
        image --> images
        image --> sky_models
        sky_models --> tessellate