Subsections In a nutshell Principle Algorithms to merge single-dish and interferometer information Hybridization technique (``feathering'') Pseudo-visibility technique General description Single-dish vs interferometer weight Comparison Hybridization technique and ALMA The Zero spacing: an important subset Short Spacings in practice: command UV_SHORT Practical considerations When are short-spacing information needed? How to optimize single-dish observations? Gildas manager 2023-06-01