TGraphErrors drawing options

Good afternoon,

I would like to draw a TGraphErrors

TGraphErrors* gf2simu= new TGraphErrors(n_ar_simu, eamp_ar_simu_kVcm, gain_var_ar_simu, errx_var_ar, err_gain_var_ar_simu) ;

as a continuous line surrounded by an error-shade on the Y direction (in the present case the error bar on X is equal to zero).

Does anyone know how to implement that ?

Many thanks,