MACD Line Calculation: The MACD is calculated as the difference between the fast and slow exponential moving averages (EMAs). Smoothed MACD: The regular MACD line is smoothed using a simple moving average (SMA). Signal Line: The signal line is calculated using the smoothed MACD, with its own smoothing factor. Histogram: The histogram is plotted as the difference between the smoothed MACD and the signal line, to visualize momentum.