def algo_exp(x, m, t, b):
    """mono-exponential curve."""
    return m*np.exp(-t*x)+b
def algo_exp(x, m, t, b):
    """mono-exponential curve."""
    return m*np.exp(-t*x)+b
def algo_exp ( x , m , t , b ) : return m * np . exp ( - t * x ) + b
mono-exponential curve.
mono - exponential curve .