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Response of the NT-36 Array to a Distant Point-Like Light Source

In a short test experiment in 1994, the NT-36 detector in Lake Baikal was illuminated by a laser positioned at distances up to 150 m away from the nearest photomultiplier. Experiments of this kind provide a useful cross-check of the detector calibration and of water parameters measured with dedicated devices. Furthermore, they are inevitable to our understanding of how to identify distant quasi point-like events, e. g. high energy showers due to interaction of AGN neutrinos via the Glashow resonance. We present results of the measurements and discuss them with respect to absorption and scattering of light.