Update README.md

README.md

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 HiRISE DTMs are digital terrain models created for the surface of Mars. These DTMs are generated using stereo-matching techniques on two satellite images taken from different angles as part of the High-Resolution Imaging Science Experiment (HiRISE) project.
 
-This dataset consists of xxx stereo pairs and their respective digital terrain models. More detailed descriptions about the generation of the digital terrain models are included in [1]. This dataset is important for studies in depth estimation, computer vision, and geoscience fields.
+This dataset consists of stereo pairs and their respective digital terrain models. More detailed descriptions about the generation of the digital terrain models are included in [1]. This dataset is important for studies in depth estimation, computer vision, and geoscience fields.
 
 
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