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4 (Precipitation) In a catchment of interest, there are 4 raingauges with the following coordinates X(x,y,z), horizontal coordinates x in m and y in m, and vertical coordinate (elevation) z in m a.s... For each raingauge, the observed hourly precipitation, Pr [mm], is reported over 6 hours: X1 = [1, 1, 10 ]; Pr1=[ 0.1 4.1 3.6 5.2 2.3 1.3); [mm] X2=[10,1,20]; Pr2=[ 0.9 3.2 0.9 4.1 4.7 2.6]: [mm] X3=(1, 5, 20); Pr3=[ 0 0 1.1 0.2 0]; [mm] 0 X4=[10, 5, 30]; Pr4=[ 6.7 5.6 9.8 3.2 4.5 2.6 ];[mm] How much is the interpolated precipitation at an ungauged location XO = [7, 4) on the third hour using the Thiessen Polygons method