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And here is a script that makes a plot of the phase for a single channel on a randomly chosen baseline:

from Wizardry.AIPSData import AIPSUVData
from AIPS import AIPS
 
from pylab import plot, show
from math import atan2
 
AIPS.userno = 3601
 
data = AIPSUVData('MULTI', 'UVDATA', 1, 3)
phase = []
time = []
for visibility in data:
    if visibility.baseline == [1, 2]:
        re = visibility.visibility[0, 0, 0, 0]
        im = visibility.visibility[0, 0, 0, 1]
        phase.append(atan2(re, im))
        time.append(visibility.time)
 
plot(time, phase, '.')
show()