What do the columns in this GIS file mean? Are they distances to 3 reference points?

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I was handed this file and expected to know what to do with it. Does it possibly mean that point 1 is ~6539 ft from some marker and ~11370 from another marker? Are these types of file usually in metric or standard?

Sorry for all the sub-questions, I just would like to know basically how to glean info from this file.

Sample Data:

1 6539.603 11370.224 3387.635 2 6558.233 11370.503 3387.023 3 6586.439 11357.517 3386.395 4 6604.131 11357.935 3385.786 5 6615.655 11357.978 3385.310 6 6629.992 11358.072 3385.020 7 6640.550 11358.197 3384.977 8 6659.566 11359.253 3384.952 9 6666.896 11381.068 3385.652 10 6658.798 11381.012 3385.682

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