Patent ID: 8184121

Claim:
A display apparatus, said apparatus comprising: a) a display; b) a first visual representation displayed on said display, wherein said first visual representation is based on a first data set in a measurement data record; c) a second visual representation displayed on said display, wherein said second visual representation is based on a second data set in said measurement data record; d) a first-visual-representation display marker associated with said first visual representation; e) a second-visual-representation display marker associated with said second visual representation; and f) a marker correlator wherein said marker correlator effectuates display of said second-visual-representation display marker in said second visual representation when said first-visual-representation display marker is placed in said first visual representation at a first location and when the data in said measurement data record corresponding to said first location is in said second data set; wherein a marker-unavailable indication is displayed in said second visual representation when the data in said first data set corresponding to said first location is not in said second data set.