Why same varible shown twice in Simulation Manager with parsim ?

I want to perform a parametric sweep with parsim. The variable I want to sweep is t0, the ‘Start Time’ in Simulink model, from 0 to 1 with intervals of 0.1. Other variables are loaded from external .mat file. In this .mat file, t0 is set to 0 and there are no ‘upars’’ and vpars’ variables in it. The Simulink model input_checkN1P10test1.slx’s model workspace is empty and has no Data source. When I ‘parsim’ the SimulationInput object ‘simin’, the variable ‘t0’ shown in Simulation Manager has two different values for each simin, 0 (which I think is from .mat file) and t0 values I set with SetVariable method. Judging from the output, Simulink indeed uses the t0 values set with setVariable method when I create ‘simin’ but my puzzle is why there are still two values shown in Simulation Manager?

clear all 
mdl = 'input_checkN1P10test1'; % mdl has no vars in model ws and data source
N = 10;
tset = linspace(0,1,N+1);
simin(1:N) = Simulink.SimulationInput(mdl);
load_system(mdl)
hws1 = get_param(mdl,'modelworkspace')% should be empty 
for i = 1: 10 
    simin(i) = simin(i).loadVariablesFromMATFile('inputpars_simulink.mat');
    simin(i) = simin(i).setVariable('t0',tset(i),'workspace','input_checkN1P10test1');
    simin(i) = simin(i).setVariable('upars',50*ones(1,10),'workspace','input_checkN1P10test1');
    simin(i) = simin(i).setVariable('vpars', 5*ones(1,10),'workspace','input_checkN1P10test1');
end 
simout1 = sim(simin);% 
simout2 = parsim(simin,'ShowSimulationManager','on');% 

[Rahul Kumar]

Hi Hainan,

My guess is that you have t0 defined in both the model workspace and global workspace on the SimulationInput object which is why it appears twice. Try using the following code instead and see if that fixes it (removing the Workspace value with setVariable defaults to global workspace)

simin(i) = simin(i).setVariable('t0',tset(i));