another fix for modifying array

Author: sdhoyt

imap_processing/lo/l1b/lo_l1b.py

@@ -2563,7 +2563,9 @@ def l1b_bgrates_and_goodtimes(
     bg_start_met = xr.DataArray([0.0])
     bg_end_met = xr.DataArray([0.0])
     epochs = l1b_histrates["epoch"].values.copy()
-    epochs = xr.DataArray(epochs, dims=["epoch"])
+    epochs = xr.DataArray(
+        epochs, dims=["epoch"], attrs=attr_mgr_l1b.get_variable_attributes("epoch")
+    )
     goodtimes = xr.DataArray(np.zeros((max_row_count, 2), dtype=np.int64))
     h_background_rate = xr.DataArray(np.zeros((1, NUM_ESA_STEPS), dtype=np.float32))
     h_background_rate_variance = xr.DataArray(