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Yes, you are correct. From the code:

414 void PoseDrawer(cv::Mat& drawImage, const cv::Mat& K, const PoseRT& pose)
415 {
416   Point3f z(0, 0, 0.25);
417   Point3f x(0.25, 0, 0);
418   Point3f y(0, 0.25, 0);
419   Point3f o(0, 0, 0);

The length of the drawn arrows is 0.25 meters for scale.

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