Scientific notation anomaly

[AlanC]

I'm using ngspice to analyze evolved circuits, so some of the netlists
are unusual. One netlist (shown below) has repeated exponents, but I
can't figure out how spice interprets them. Specifically, the value
for a resistor is given as 0.5E-3E-3E-4, but I can't figure out what
ngspice actually uses for the value. I tried simulating this circuit
using 0.5E-10 but I get different output, so it isn't just multiplying
the values. Any ideas?

EVOLVED.CIR - Evolved circuit

VS 1 0 AC 1 SIN(0VOFF 1VPEAK 2KHZ)

C1 2 0 4
R2 1 2 78E-7
R3 1 2 0.5E-3E-3E-4

.AC DEC 5 10 10MEG
.PRINT AC VM(2)

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