text: from pandas import DataFrame, read_csv
  from numpy import array
  
  def load_PES_from_2d_csv(filename):
      '''
      Function for loading a 2D PES from a csv file containing all the energies in a bidimensional matrix (only the values, no labels nor titles)
  
      TODO:
          - [ ] Add possibility of using header or not and to specify columns and rows
      '''
  
      pes_pd = DataFrame(read_csv(filename, header=None))
      pes_np = array(pes_pd)
  
  
      return pes_np, pes_pd
  