def jacobian_transformed_to_physical(x, lower, upper):
    """
    Compute the Jacobian of the transformation from unconstrained parameters to physical parameters
    
    Parameters
    ----------
    x : float
        Any array
    lower : float
        Lower limit of the parameter
    upper : float
        Upper limit of the parameter

    Returns
    -------
    out : float
        Transformed parameters
    """    
    return (upper - lower) / ((lower - x) * (x - upper))