=============
Configuration
=============

CalibrationConfig
-----------------

.. list-table::
   :header-rows: 1
   :widths: 22 12 12 54

   * - Field
     - Type
     - Default
     - Description
   * - ``obs_mode``
     - ObsMode
     - Auto
     - Observation mode (auto-detected if Auto)
   * - ``pwv_source``
     - PwvSource
     - FitGridRefine
     - PWV retrieval strategy
   * - ``pwv_initial_guess``
     - f64
     - 1.0
     - Initial PWV guess for fitting (mm)
   * - ``pwv_grid_min``
     - f64
     - 0.01
     - Minimum PWV in grid search (mm)
   * - ``pwv_grid_max``
     - f64
     - 10.0
     - Maximum PWV in grid search (mm)
   * - ``pwv_grid_steps``
     - usize
     - 100
     - Number of grid search points
   * - ``pwv_per_pixel``
     - bool
     - false
     - Fit PWV independently per pixel
   * - ``clip_tsys``
     - f64
     - 200.0
     - Bad channel T_rec threshold multiplier (K)
   * - ``clip_counts``
     - f64
     - 0.01
     - Minimum hot-cold count ratio
   * - ``eta_fss``
     - f64
     - 1.0
     - Forward scattering efficiency
   * - ``eta_mb``
     - f64
     - 1.0
     - Main beam efficiency
   * - ``gain_el_correction``
     - f64
     - 1.0
     - Elevation-dependent gain correction
   * - ``n_threads``
     - Option
     - auto
     - Rayon thread pool size
   * - ``physics``
     - Physics
     - Exact
     - Physics constants precision

ObsMode
-------

.. list-table::
   :header-rows: 1
   :widths: 25 25 50

   * - Variant
     - CLI value
     - Description
   * - ``Auto``
     - ``auto``
     - Auto-detect from data
   * - ``TotalPower``
     - ``totalpower``, ``tp``
     - Position-switched ON/OFF
   * - ``OtfTotalPower``
     - ``otf``, ``otf_totalpower``
     - On-the-fly scanning
   * - ``FrequencySwitch``
     - —
     - Future: frequency-switched reference
   * - ``BeamSwitch``
     - —
     - Future: beam-switched reference

PwvSource
---------

.. list-table::
   :header-rows: 1
   :widths: 25 75

   * - Variant
     - Description
   * - ``FitGridRefine``
     - Grid search (100 points) + Newton refinement (5 iterations)
   * - ``FitLM``
     - Levenberg-Marquardt least-squares (fallback)
   * - ``External(f64)``
     - Fixed PWV value in mm (no fitting)

PhysicsConstants
----------------

.. list-table::
   :header-rows: 1
   :widths: 25 30 45

   * - Variant
     - :math:`h/k_B`
     - Notes
   * - ``Exact``
     - SI 2019, f64
     - Production default
   * - ``KalibrateCompat``
     - 0.047995 K/GHz, f32 truncation
     - Legacy parity mode