sys instead of system

[Teusia]

Hello,

Small heads up in the following line:

Python-utils/vigan/optics/hexa.py

Line 586 in 5e45c4c

status = np.abs(sys).sum(axis=0)

The function plot of hexa.py tries to use sys which is not defined in the function. I suspect this should be system instead.
Cheers,
Anne-Laure