Convention for expectation_counts

[zlatko-minev]

Is the convention in the docstring backwards for
https://qiskit.org/documentation/stubs/qiskit.ignis.verification.expectation_counts.html#qiskit.ignis.verification.expectation_counts ?

It seems that the Pauli of q0 is left-most, not right-most as I read in the docs?

This is what I see as the output of

import pandas as pd 
from qiskit import *
from qiskit.ignis.verification import expectation_counts, marginal_counts

qc = QuantumCircuit(2)
qc.x(0)
qc.measure_all()
job = execute(qc, simulator_ideal, shots=1000)
counts = job.result().get_counts()

display(qc.draw(output='mpl'))

total = sum(counts.values())
expects = expectation_counts(counts) 
expects = {k.replace('0', 'I').replace('1', 'Z'): v/total for k,v in expects.items()}
pd.Series(expects)

returns

II    1.0
ZI   -1.0
IZ    1.0
ZZ   -1.0

for