(a) Intensity map for the high-resolution data. The centre is marked with A. B is the brightest H ii region, located at the end of the western arm. C and D refer to other regions of massive star formation, found at the ends of the bar and near the beginning of the arms. (b) Velocity map for the high-resolution data. (c) Dispersion velocity map for the high-resolution data. (d) Intensity map for the low-resolution data. (e) Velocity map for the low-resolution data. (f) Dispersion velocity map for the low-resolution data. The centre of the galaxy is indicated with a cross; calibrated colours are labelled in the vertical colour bars.