[en] There are a large number of codes treating wave propagation in plasmas. All of these use very different approaches depending on what there are dedicated to study. The LEMan code [1], which was developed in CRPP, is designed to treat electromagnetic waves in the low-frequency range (i.e. Alfven and ion cyclotron domain) in a 3D geometry. With this constraint, the most obvious method was to use a full wave code. The reason for that is the variation of the plasma parameters during a period of the wave because the low frequency domain involves long wavelengths. Other methods like WKB are not fully adapted for this purpose. As a first step, developments were formulated with a cold model. The code solves the following relation derived from the Maxwell's equations. (Author)