   // draw the 'thousands' markers
   draw_thousands();
 
+#if 0
+  // draw the 'edge of digits' markers
+  for (int i = 0; i <= NUM_F_CHAR; ++i)
+    tft.drawFastVLine(char_x_offset[i], 44, 6, ILI9341_RED);
+#endif
+
   // show the frequency
   display_frequency();
 

#define ONLINE_X            0
#define ONLINE_Y            (ts_height - ONLINE_HEIGHT)
#define ONLINE_BG           ILI9341_RED
#define ONLINE_BG2          ILI9341_RED
#define STANDBY_BG          ILI9341_GREEN
#define STANDBY_BG2         0x4000
#define ONLINE_FG           ILI9341_BLACK

// MENU button definitions
#define MENU_WIDTH          110

    tft.fillRoundRect(ONLINE_X+1, ONLINE_Y+1, ONLINE_WIDTH-2, ONLINE_HEIGHT-2, BUTTON_RADIUS, STANDBY_BG);
    tft.setCursor(ONLINE_X + 7, SCREEN_HEIGHT - 10);
    tft.setFont(FONT_BUTTON);
    tft.setTextColor(STANDBY_FG);
    tft.print("Standby");
  }
  else
