def write_profile_exp(name, profile, file_txt):
    """Write the experimental CPMG profile."""
    file_txt.write('[{}]\n'.format(name.upper()))
    file_txt.write('# {:>17s}   {:>17s} {:>17s} {:>17s}\n'.format('NU_CPMG',
        'R2', 'UNCERTAINTY_DOWN', 'UNCERTAINTY_UP'))
    for nu_cpmg, _r2_cal, r2_exp, r2_erd, r2_eru in sorted(zip(*profile)):
        file_txt.write('  {0:17.8e} = {1:17.8e} {2:17.8e} {3:17.8e}\n'.
            format(nu_cpmg, r2_exp, r2_erd, r2_eru))
    file_txt.write('\n')
