a)–d) NST Hα-0.8 Å, Hα-0.4 Å, and Hα line center images showing the interaction of two loop systems (L1 and L2) and the associated C-class flare. The size of each image a)–d) is ~50′′× 35″. e), f) NST Hα line center and Hα-0.8 Å images showing the flux rope produced by the interaction of cool loops. The size of each image e), f) is ~57′′× 45″. Each division on the x- and y-axes is equal to 1″. The coalescence of loops (L1 and L2) and formation of a resulting flux rope is shown in the Hα line center (panel e)) and Hα-0.8 Å (panels a), b), d), and f)) animations available online.