def PowerlawPlusConstant(q, A, alpha, C):
    """A power-law curve plus a constant

    Inputs:
    -------
        ``q``: independent variable (momentum transfer)
        ``A``: scaling factor
        ``alpha``: exponent
        ``C``: additive constant

    Formula:
    --------
        ``A*q^alpha + C``
    """
    return A * q ** alpha + C