Scientific Reports 3, Article number: 2399 (2013); Published: 9 August 2013; Updated: 20 November 2013

This Article contains a typographical error in the Methods section.

“The room temperature STM experiments were done with an Omicron 1 STM whereas the low temperature experiments were carried out at ~77 K in an Omicron low temperature STM/AFM microscope hosted in an ultra-high vacuum chamber with a base pressure in the temperature.”

should read

“The room temperature STM experiments were done with an Omicron 1 STM whereas the low temperature experiments were carried out at ~77 K in an Omicron low temperature STM/AFM microscope hosted in an ultra-high vacuum chamber with a base pressure in the 10−11 mbar range. The sample and tips were cooled down to liquid nitrogen temperature.”