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Thanks to the author!
I advise those who wish to repeat this construction, if possible, to use not TKST2103, but TKST2202. And even better - TKST2300. The smaller the aperture of the sensor, the more accurate it works and the better the repeatability will be. And the dimensions of all three sensors are the same.
Look datasheet, https://www.vishay.com/docs/81147/tcst2103.pdf