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This letter presents a $9\times 35$ arrayed waveguide grating (AWG) operating at 1265–1365 cm$^{\mathrm { {-1}}}$ designed for gas sensing applications. The phenomenon of channel spacing variation depending on the position of the input light is demonstrated experimentally. First, the theoretical background is presented. Then, simulations are compared with experimental measurements on 1315-cm$^{-1}$ ...