 However, since its release, there have been significant advancements in geophysical data acquisition, such as 3-dimensional seismic techniques and high speed, high capacity recording.The most recent revision of the SEG-Y format was published in 2017, named the "rev 2.0" specification.It still features certain legacies of the original format (referred as "rev 0"), such as an optional SEG-Y tape label, the main 3200 byte textual EBCDIC character encoded tape header and a 400 byte binary header.