Effect of ten offset threads on integrated intensity along the slit. The first panel (top left) is one thread and each subsequent panel includes one additional thread behind the first. The blue line is the total integrated intensity along the slit, and the dotted orange is the integrated intensity added in this panel. The x-axis is measured relative to the centre of the front-most (10th) thread. The units on the y-axis are erg s⁻¹ cm⁻² sr⁻¹. This plot originally appeared in Peat (2023).