# GDF UV Tables

Subsections

- Why a new implementation of the UV Tables in GILDAS?
- UV tables subversions and Doppler factor
  - Version 2.0: Historical Frequency implementation
  - Version 2.1: Global Doppler implementation
  - Version 2.2: Local Doppler implementation
- The new layout
  - Data Format Identification
  - Dap positions and size
    - Restriction on the use of real(8) daps
    - Are real(4) U,V,W coordinates sufficient?
  - Complex visibilities
  - Telescope information
- The new layout for polarimetry data
  - Nomenclature
  - In practice