Figure 2From: Testing the VEMCO Positioning System: spatial distribution of the probability of location and the positioning error in a reservoir Relation between the mean positioning error (A) and number of calculated positions (B) with the HPE filter values. The dotted lines are the standard deviations (mean ± SD), and the red lines show the value of 15 for the HPE filter. Note the discontinuity of the x-axis; HPE filters between 30 and 5770 (only 28 positions concerned) have not been shown for clarity. HPE, horizontal position error.Back to article page