import numpy as np
import matplotlib.pyplot as plt

plt.rcParams["font.family"] = "serif"
plt.rcParams["font.size"] = 14
plt.rcParams["mathtext.fontset"] = "cm"
plt.rcParams["axes.facecolor"] = "white"
plt.rcParams["axes.linewidth"] = 0
plt.rcParams["xtick.direction"] = "in"
plt.rcParams["ytick.direction"] = "in"


npts = 100
x = np.geomspace(1e-6, 3, npts//2)
x = np.hstack((-x[::-1], [0], x))
y = np.sqrt(np.abs(x)) + 0.5
plt.figure(figsize=(6, 4))
plt.plot(x, y, label=r"$\sqrt{