Typo fix.

pes_to_spec/model.py

@@ -542,7 +542,7 @@ class Model(TransformerMixin, BaseEstimator):
 
     def get_low_resolution_range(self) -> Tuple[int, int]:
         """Get bin number with first and last relevant bins in the low-resolution spectrum."""
-        return self.x_model.named_steps['select'].tof_start, (self.x_model.named_steps['select'].tof_start + self.y_model.named_steps['select'].delta_tof)
+        return self.x_model.named_steps['select'].tof_start, (self.x_model.named_steps['select'].tof_start + self.x_model.named_steps['select'].delta_tof)
 
     def debug_peak_finding(self, low_res_data: Dict[str, np.ndarray], filename: str):
         """