how can I use wrdata to save data to a text file from multiple dc runs?The ngspice command is given below .param L=0.15 .options savecurrents .dc v1 0 1.8 25m .control let start_l = 0.15 let stop_l = 3 let delta_l = 0.01 let l_act = start_l while l_act le stop_l alterparam L = $&l_act reset save all save @m.xm1.msky130_fd_pr__nfet_01v8[gm] save @m.xm1.msky130_fd_pr__nfet_01v8[L] run remzerovec write lut.raw let l_act = l_act + delta_l set appendwrite end .endc