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))
        """