new_contents: import matplotlib.pyplot as plt
  from matplotlib.style import use
  from halomod import TracerHaloModel
  
  use("seaborn-paper")
  
  tr = TracerHaloModel()
  plt.figure(figsize=(4, 2.8))
  plt.loglog(tr.r, tr.corr_auto_tracer, label="z=0")
  tr.z = 1
  plt.loglog(tr.r, tr.corr_auto_tracer, label="z=1")
  tr.hod_params = {"M_min": 8}
  plt.loglog(tr.r, tr.corr_auto_tracer, label="Mmin=8")
  plt.legend()
  plt.xlabel("r [Mpc/h]")
  plt.ylabel(r"$\xi_{gg}(r)$")
  plt.tight_layout()
  plt.savefig("/home/steven/Desktop/toy_example.pdf")
  
subject: add a dumb example for plotting for paper