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The calibration process involves an iterative sequence of 3 steps: (1) matching the points of eye-tracking data with the text grids and boundary grids, (2) computing the weight for each point pair, and (3) optimizing the calibration parameters that best align point pairs through gradient descent. During this process, we assume that, from a holistic perspective, the gaze will cover the text area, effectively filling it after sufficient reading. Meanwhile, on a granular level, the gaze duration is influenced by the semantic and positional features of the text. Therefore, factors such as the presence of empty space, the positional features of tokens, and the depth of constituency parsing play important roles in calibration. Our method achieves accuracy error comparable to traditional 7-point mehtod after naturally reading 3 texts, which takes about 51.75 seconds. 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