asciireader: make index in label consistent with selection

src/nmreval/io/asciireader.py

@@ -183,7 +183,13 @@ class AsciiReader:
                 single_len = 2
                 stepsize = 2
 
-            cls = {'points': Points, 'fid': FID, 'spectrum': Spectrum, 'bds': BDS, 'dsc': DSC}[mode]
+            cls = {
+                'points': Points,
+                'fid': FID,
+                'spectrum': Spectrum,
+                'bds': BDS,
+                'dsc': DSC,
+            }[mode]
 
             for j in range(1, num_y+1, stepsize):
                 if col_names is not None:
@@ -191,7 +197,7 @@ class AsciiReader:
                     kwargs['name'] = col_names[j-1]
                 elif num_y > single_len:
                     # more than one axis, append column number
-                    kwargs['name'] = filename + '_' + str(y[j-1])
+                    kwargs['name'] = f'{filename}_{y[j-1]+1}'
 
                 if j+num_y < raw_data.shape[2]:
                     kwargs['y_err'] = raw_data[i, :, j+num_y]