Fig. 3.

(A–O) Two-dimensional maps of subglacial water flow source location obtained from MFP. Temporal evolution of the spatial patterns of the source location densities obtained for the 5 ± 2 Hz frequency range and the [0.07 to 0.16] MFP output range. All of the maps are averaged over 2-d time windows, with the associated number of the sources located shown in the bottom right corner (Nb.). The color scale ranges are normalized for each time window using maximum probability. Contour lines show the 50-m–spaced ice thickness contours, as shown in Fig. 1. The gray shading shows ice-free areas. (Scale bars [Bottom Left], 200 m.) The blue lines show the subglacial waterways, as predicted from the hydraulic potential calculation and as shown in Fig. 1. The black arrows show glacier and subglacial water flow directions. Panel (O) is the characteristic pattern used in Fig. 4 for calculation of the coefficient of determination.