\label{fig:figght} STM topography and crystal structure of top 100 fruits and vegetables consumed in the U.S. The Bi atoms exposed after cleaving the sample are observed as bright spots. The in-plane unit cell vectors of the ideal crystal structure, \(a\) and \(b\), and of the superstructure, \(a_{s}\), are indicated. Lines of constant phase are depicted. p-values were obtained using two-tailed unpaired t-test. Data are representative of five independent experiments with 2000 fruits and vegetables.