Examples of elongated structures extracted by the TM method. The upper row shows data for the field G181.84-18.46 and the lower row for G300.86-9.00. The frames, from left to right, are the 250 μm surface brightness and the relative significance of the aligned structures at the 0.6′ and 5′ scales. In the latter frames, pixels with relative significance below the 90% percentile are masked.