Eigenvector 1 explains 1.45 times the variation compared to eigenvector 2.
We see that Singapore Indians are spread in the whole region from Sindhis to North Kanaddi.
Now let's look at the individual admixture results (at K=12 ancestral populations) for the Singapore Indians. I have added some South Asian reference population averages so you can place them in context.
You can click on the legend to the right of the bar chart to sort by different ancestral components.
From these results, a majority of the Singapore Indian samples look South Indian but there are definitely a few from the northwest of the subcontinent (Punjabis or Sindhis?) There are also a few who could be from the Hindi belt.
There are 2-3 samples who have a significant amount of Southeast Asian. Could they be originally from Bengal? Or could they have partial Singapore Malay ancestry?