Reconstructed image of NGC 3132 in the [N II]λ6584 emission line, made by simulating the action of a narrow filter (see main text for details). The orange and violet rectangles mark the area used to extract the spectra of the newly detected northern and southern arcs (see Sects. 3 and 9). Here, and in forthcoming maps, this image willbe presented for reference with ten evenly spaced contours (in logarithmic scale), ranging from 1 × 10⁻¹⁸ erg cm⁻² s⁻¹ (white) to 1 × 10⁻¹⁴ erg cm⁻² s⁻¹ (black).