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LMZ30606: pin 37 layout

Part Number: LMZ30606

Hi.

Pin 37 dimension is 1.6X1.6mm

in page 31, layout example it is shown the pin and a 2.8mmX2.8mm square with thermal vias. 

my questions are:

1. my pcb editor built the pad as a 2.8mmX2.8mm and solder mask opening of 1.6X1.6 mm...is this correct? or should it been 1.6mmX1.6mm pad layout and make vias around it?