def patch(path, ao):
    if "MARKII_1985_I209198" in path:
        # set bin width
        if "d01" in path:
            for p in ao.points():
                p.setXErrs(0.5)
        # bin width problematic (best effort)
        elif "d02" in path:
            edges=[0.084,0.094,0.104,0.124,0.157,0.190,0.223,0.256,
                   0.289,0.322,0.355,0.423,0.491,0.559,0.627,0.695]
            ix=0
            for p in ao.points() :
                p.setXErrs((p.x()-edges[ix],edges[ix+1]-p.x()))
                ix+=1
    return ao