Fix in gammapy/spectrum/tests/test_flux_point.py
@@ -343,7 +343,7 @@ class TestFluxPoints:
def test_drop_ul(self, flux_points):
flux_points = flux_points.drop_ul()
- assert not np.any(flux_points._is_ul)
+ assert not np.any(flux_points.is_ul)
def test_stack(self, flux_points):
stacked = FluxPoints.stack([flux_points, flux_points])
