Selected examples of T-type longitudinal (blue) and transversal (red) column density profiles. In contrast to R-type filaments, T-type filaments do not exhibit head-tail morphology. Their longitudinal profiles are generally flat, with dense cores and star formation distributed along their length and no significant mass accumulation toward either end. Interestingly, their transversal profiles often display asymmetry, suggesting mass “spillover” on the side facing away from the feedback flow. This asymmetry is another distinguishing feature compared to R-type filaments.