Update app.py

app.py

@@ -120,13 +120,13 @@ def process_sequence(sequence, domain_bounds, n):
     # Plotting the heatmap
     domain_len = end - start
     if 500 > domain_len > 100:
-      step_size = 50
+      step_size = 49
     elif 500 <= domain_len:
-      step_size = 100
+      step_size = 99
     elif domain_len < 10:
       step_size = 1
     else:
-      step_size = 10
+      step_size = 9
     x_tick_positions = np.arange(start_index, end_index, step_size)
     x_tick_labels = [str(pos + 1) for pos in x_tick_positions]