code: def lower_price_channel(data, period, lower_percent):
      
      catch_errors.check_for_period_error(data, period)
  
      emas = ema(data, period)
      lower_channel = [val * (1-float(lower_percent)/100) for val in emas]
      return lower_channel
docs: Lower Price Channel.
  
      Formula:
      lpc = EMA(t) * (1 - lower_percent / 100)