Update src/8_many_atoms_sol.md

src/8_many_atoms_sol.md

@@ -69,7 +69,6 @@ pyplot.xlabel('$ka$'); pyplot.ylabel(r'$E-\epsilon$')
 pyplot.xticks([-2*pi, -pi, 0, pi,2*pi], [r'$-2ka$',r'$-ka$', 0, r'$ka$',r'$2ka$'])
 pyplot.yticks([-t1-t2, np.abs(t1-t2), 0, -np.abs(t1-t2), t1+t2], [r'$-t_1-t_2$',r'$-|t_1-t_2|$', '0', r'$|t_1-t_2|$', r'$t_1+t_2$']);
 pyplot.vlines([-pi, pi], -3, 3, linestyles='dashed');
-pyplot.hlines([np.abs(t1-t2),-np.abs(t1-t2)],-2*pi,2*pi, linestyles='dashed');
 
 pyplot.legend(loc='lower center');
 ```