(e) The upper critical fields Hc2(T) for in-plane and out-of-plane field orientations, with error bars of ± 0.05 T. The black line shows H||ab, whereas the red line refers to H||c. 16.4 16.2 T = 3.75 K 16.0 15.8 T = 3.70 K 15.6 T = 3.65 K –80 –60 –40 ...