def METHOD_NAME():
    with open("runDB.json") as f:
        runDB = json.load(f)
    tier_dir = os.path.expandvars(runDB["tier_dir"])
    meta_dir = os.path.expandvars(runDB["meta_dir"])
    df = pd.read_hdf('{}/t2_run{}.h5'.format(tier_dir,sys.argv[1]))
    m = np.array(df['e_ftp'])
    plt.hist(m, np.arange(0,9500,0.5), histtype='step', color = 'black', label='non-calibrated spectrum')
    plt.xlabel('e_ftp', ha='right', x=1.0)
    plt.ylabel('Counts', ha='right', y=1.0)
    plt.xlim(0,9500)
    #plt.ylim(0,4000)
    plt.legend(frameon=True, loc='upper right', fontsize='small')
    plt.show()