Issue on page /tutorials/W1D2_StateoftheClimateOceanandAtmosphereReanalysis/student/W1D2_Tutorial6.html

[joaoambiente]

Cell contents such as this one would benefit from more thorough explanations about what is being done.
Also, the dA coordinate is mentioned but dX is used.

# plot a zonal mean slice of this data. we take a mean just in longitudes by dividing the dA coordinate by the
fig, ax = plt.subplots(figsize=(8, 6))
(
    ((subset_theta - 273.15) * subset_theta.dX).sum("longitude")
    / (subset_theta.dX.sum("longitude"))
).plot(ax=ax)
ax.set_title("Global zonal mean of temperature (C)")

In this example, the comment is simply incomplete.
Please watch out for other cells with incomplete comments.