new_contents: import numpy as np
  from functools import partial
  
  
  name_func_dict = {
      'backgate': {'label': 'Backgate voltage (V)'},
      'MC': {'label': 'Mixing chamber temperature (K)'},
  }
  
  def parent_f(data, pdata, meta):
      return data['MC'] * 10
  
  name = 'MC*10'
  func = partial(parent_f)
  label = 'MC temperature in unhelpful units'
  name_func_dict[name] = {'func': func, 'label': label}
  
subject: Add sample file for pseudocolumns