Filling leaves a gap between the function curve and the axis
Show[Plot[PDF[NormalDistribution[0, 1], z], {z, -3, 6}],
Plot[PDF[NormalDistribution[0, 1], z], {z, c=1.4, 6}, Filling -> Axis]
]

But for other values (e.g., c=0.5 instead of c=1.4 in the above code), the Filling is correct. Is this a bug or am I making some subtle error?
PlotRange -> Allto the second plot. – Alexey Popkov Apr 06 '14 at 16:42