For information on field definitions see Guide to Hipparcos Double & Multiple Systems Annex fields (pdf)
Field Value Field Description DX1 : 80763 Hipparcos Catalogue (HIP) identifier DX2 : 3.37 Cosmic error, epsilon (mas) DX3 : 0.59 Standard error of epsilon, sigma_epsilon (mas) DX4 : Flag indicating a note at the end of relevant volume HGNOTES HDNOTES HPNOTES