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Removing one layer from the tracker: layer 2 TBPS.

  Barrel TBPS {
    numLayers 2  <---- previously 3
    maxZ 1150
    startZMode moduleedge
    compressed true
    innerRadius 230
    ...}
    

Impact parameter resolution is almost identical to the Technical Proposal. Slight improvement in the pt resolution due to the reduction of material budget.

Real
1 GeV	 		        TDR				
C	I		C	I	
pT	0.42274 0.9349          0.43846 1.00621
d	0.0055	0.00713		0.00533	0.00703	
z0	0.00722	0.01342	        0.00723	0.01342	
    
Ideal    
1 GeV	   	                TDR				
C	I		C	I	
pT	0.01058 0.03605         0.00979 0.03174
d	0.00089	0.00110		0.00088	0.00107	
z0	0.00269	0.00271	        0.00264	0.00270