Moment and physical parameter maps of V1057 Cyg: a) ¹³CO integrated intensity; b) C¹⁸O integrated intensity; c) ¹³CO intensity weighted velocity; d) C¹⁸O intensity weighted velocity; e) C¹⁸O column density; f) temperature. The black cross marks the position of the FUor and letters indicate the clumps that are discussed in the text. The solid contours mark the nσ_int levels (the multiples of the noise level on the map); σ_int = 0.17 Jy beam^-1 km s^-1 and n = 3, 4, ..., 8 on (a) and σ_int = 0.014 Jy beam^-1 km s^-1 and n = 3, 6, ..., 18 on (b). The pixels with C¹⁸O peak values less than 9σ are coloured grey on panels d, e and f.