multi-line graph Telegram

def telegram_EMA(sma, back=50, show=False):
    
    file = 'EMAs.jpg'

    ax = sma[-back:].plot(y="BTCUSDT_C", kind="line", color="k", \
                          linewidth=3, use_index=True, x_compat=True, \
                          rot=25, linestyle='-', figsize=(6, 5))
    sma[-back:].plot(y="EMA20", kind="line", ax=ax, color="y", \
                     x_compat=True, rot=25, linestyle=':', figsize=(6, 5))
    sma[-back:].plot(y="EMA50", kind="line", ax=ax, color="r", \
                     x_compat=True, rot=25, linestyle=':', figsize=(6, 5))
    sma[-back:].plot(y="EMA200", kind="line", ax=ax, color="b", \
                     x_compat=True, rot=25, linestyle=':', figsize=(6, 5))

    plt.savefig(file, bbox_inches='tight')
    if show:
        plt.show()
    plt.close()

    url = f"https://api.telegram.org/bot{TELEGRAM_BOT_KEY}/sendPhoto"
    files = {}
    files["photo"] = open(file, "rb")
    if not show:
        requests.get(url, params={"chat_id": TELEGRAM_CHAT_ID}, files=files)

    return