Fig. 1From: How to improve the accuracy of height data from bird tracking devices? An assessment of high-frequency GPS tracking and barometric altimetry in field conditionsDistributions of the recorded heights above ground level from stationary positions on the ground for each tag model and method. The lines connect the proportions of positions per height class of 5 m (central class centred around zero). Height data < − 50 and > 50 m a.g.l. not shown. Prop. proportion, LF low frequency, HF high frequencyBack to article page