Function iqsm_multi_echo 

pub fn iqsm_multi_echo(
    phases: &[&[f64]],
    magnitudes: &[&[f64]],
    mask: &[u8],
    grid: &Grid,
    tes: &[f64],
    b0: f64,
    phase_sign: f64,
    eroded_rad: i32,
    model_onnx: &[u8],
    tile: Option<&TileConfig>,
    weighting: IqsmEchoWeighting,
) -> Result<Vec<f64>, OnnxError>

Multi-echo iQSM: reconstruct each echo and combine them with weighting (see IqsmEchoWeighting; the default is (magnitude·TE)², the inverse-variance weight). phases/magnitudes are per-echo volumes; tes the echo times (s). Without magnitudes the weights are TE² alone (uniform magnitude).

tile: None runs each echo on the whole volume; Some runs it patch by patch (see the module docs), the mask eroded once on the whole volume first.