"""
Calculate and plot Hs
=====================

Plots Hs calculated from spectra dataset

"""
import matplotlib.pyplot as plt
from wavespectra import read_ww3


dset = read_ww3("../_static/ww3file.nc")

fig = plt.figure(figsize=(8, 4))
hs = dset.spec.hs()
p = hs.plot.line(x="time")