docs: def simple_prot(x, start):
      """Find the first peak to the right of start"""
  
      # start must b >= 1
  
      for i in range(start,len(x)-1):
          a,b,c =  x[i-1], x[i], x[i+1]
          if b - a > 0 and b -c >= 0:
              return i
      else:
          return None