Fixes key error after svo_filters dropped the centers attribute

exoctk/limb_darkening/limb_darkening_fit.py

@@ -298,7 +298,7 @@ def calculate(self, Teff, logg, FeH, profile, mu_min=0.05, ld_min=0.01,
         for n, ldarr in enumerate(scaled_ld):
 
             # Get effective wavelength of bin
-            wave_eff = bandpass.centers[0, n].round(5)
+            wave_eff = np.mean(bandpass.wave[0])
 
             try:
 
@@ -314,8 +314,8 @@ def calculate(self, Teff, logg, FeH, profile, mu_min=0.05, ld_min=0.01,
                 # Check the count
                 result['name'] = name or 'Calculation {}'.format(self.count)
                 self.count += 1
-                if len(bandpass.centers[0]) == len(scaled_ld) and name is None:
-                    result['name'] = '{} {}'.format(str(round(bandpass.centers[0][n], 2)), self.model_grid.wave_units)
+                if bandpass.wave.shape[0] == len(scaled_ld) and name is None:
+                    result['name'] = '{:.3f}'.format(np.mean(bandpass.wave[0]).round(2))
 
                 # Set a color if possible
                 result['color'] = color or self.ld_color[profile]