Vertical TEC time series at three locations with different eclipse magnitudes: Faroe Islands (total, 100% obscuration), Brussels (partial, 80% obscuration) and Belgrade (partial, 50% obscuration) for the eclipse day, 20 March 2015 (A, D, G) and the reference day, 21 March 2015 (B, E, H). The solid black lines indicate the instantaneous TEC measurements while the solid grey lines are the median TEC values based on the previous 15 days. The vertical bars show the standard deviations (2σ) centred on the median values. The shading indicates the eclipse period with the exact time of the maximum obscuration marked by an arrow. (C, F, I) The relative deviations of the eclipse day measurements from the reference-day measurements.