Modified the axis_x and axis_y fields of SensorData to be keyword-only.

Author: roytsmart

msfc_ccd/_images/_sensor_images.py

@@ -141,15 +141,15 @@ class SensorData(
     outputs: na.ScalarArray = dataclasses.MISSING
     """The underlying array storing the image data."""
 
-    axis_x: str = dataclasses.MISSING
+    camera: AbstractCamera = dataclasses.MISSING
+    """A model of the sensor used to capture these images."""
+
+    axis_x: str = dataclasses.field(default="detector_x", kw_only=True)
     """The name of the horizontal axis."""
 
-    axis_y: str = dataclasses.MISSING
+    axis_y: str = dataclasses.field(default="detector_y", kw_only=True)
     """The name of the vertical axis."""
 
-    camera: AbstractCamera = dataclasses.MISSING
-    """A model of the sensor used to capture these images."""
-
     @classmethod
     def from_fits(
         cls,