text: 
  """
  Hello! I am the docstring heading the top level __init__.py in xhorizon.
  """
  
  ######### FROM SKELETON ###########
  
  from importlib.metadata import version
  __version__ = version("xhorizon")
  
  ###################################
  
  ## external
  import numpy as np
  import matplotlib.pyplot as plt
  plt.style.use("classic")
  
  ## main subpackages
  from xhorizon import tortoise
  from xhorizon import diagram_tools
  from xhorizon import shell_junction
  
  ## convenience names
  from xhorizon.tortoise import metfunc_factory as mf
  from xhorizon.diagram_tools import region_factory as reg
  from xhorizon.diagram_tools import curvemakers as cm
  
  ## alternate sub names
  from xhorizon import shell_junction as junc
  
  ## more convenience names
  from xhorizon.diagram_tools.plotstyle import newfig, pubrc
  from xhorizon.diagram_tools.curve_class import curve
  from xhorizon.diagram_tools.diagram_classes import diagram, region, block
  from xhorizon.tortoise.metfunc_tests import func_test
  
  ## more convenience names
  from xhorizon.diagram_tools import block_masks as mask
  from xhorizon.diagram_tools import block_fill as fill
  from xhorizon.shell_junction import reg_corner_masks as cornermask
  
  
  ## evap subpackage needs to be loaded after the above due to circular import issue
  from xhorizon import evap
  
  