docs: def plot_prof_1(self, mod, species, xlim1, xlim2, ylim1, ylim2,
                      symbol=None):
          """
          plot one species for cycle between xlim1 and xlim2
  
          Parameters
          ----------
          mod : string or integer
              Model to plot, same as cycle number.
          species : list
              Which species to plot.
          xlim1, xlim2 : float
              Mass coordinate range.
          ylim1, ylim2 : float
              Mass fraction coordinate range.
          symbol : string, optional
              Which symbol you want to use.  If None symbol is set to '-'.
              The default is None.
  
          """
          DataPlot.plot_prof_1(self,species,mod,xlim1,xlim2,ylim1,ylim2,symbol)
          """
          tot_mass=self.se.get(mod,'total_mass')
          age=self.se.get(mod,'age')
          mass=self.se.get(mod,'mass')
          Xspecies=self.se.get(mod,'iso_massf',species)
          pyl.plot(mass,np.log10(Xspecies),'-',label=species)
          pyl.xlim(xlim1,xlim2)
          pyl.ylim(ylim1,ylim2)
          pyl.legend()
  
          pl.xlabel('$Mass$ $coordinate$', fontsize=20)
          pl.ylabel('$X_{i}$', fontsize=20)
          pl.title('Mass='+str(tot_mass)+', Time='+str(age)+' years, cycle='+str(mod))
          """