ACSFiducial = measure_fiducial_lines(
    ACSSub['Vvega'].values,
    ACSSub['Ivega'].values,
    ACSSub['err'].values,
    ACSSub['err.2'].values,
    binSize='uniformCS',
    targetStat=100,
    mcruns=5,
    convexHullPoints=50,
    nPops=1)