import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import Normalize


measurements = np.array(
    [
        [18, 20, 23, 26, 28],
        [17, 21, 24, 27, 30],
        [16, 19, 22, 25, 29],
        [15, 18, 21, 24, 27],
    ]
)
norm = Normalize(vmin=15, vmax=30)