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when plot()ing, where can i call .lower() and .upper() in order to get the band of uncertainty?

when i plot a function with parameters with and upper and lower value like this:

p1=plot( v_ges_rhs.subs({
                d_e : RIF(.999,1.001),
                x : -.25,
                d_m : RIF(.05,.15),
                e_m : e_0 * RIF(80.5,81.5),
                e_s : e_0 * RIF(3,4)
               }), ( d_k, 0.2, .99 ) )

at what point can i call .lower() or .upper() to get the lower or upper boundary of my function? I would then overlay both into one graph for visualisation of the error.