By inspection, the databank file is seen to be an ASCII text file containing a single data series.
From the en.wikipedia.org
A fundamental simplifying assumption of Unix was its focus on ASCII text for nearly all file formats.
From the en.wikipedia.org
Data exchange was mostly performed though standard formats like ASCII text or CSV, or through specialized file conversion programs.
From the en.wikipedia.org
For example, a binary file interpreted by the ASCII character set will result in text being displayed.
From the en.wikipedia.org
A text file can contain any stream of characters, encoded for example as ASCII or Unicode, including possible control characters.
From the en.wikipedia.org
They can be used in file formats where only ASCII bytes are used for keywords and file format syntax, while bytes 0x80-0xFF might be used for free text, including most programming languages.
From the en.wikipedia.org
The NUL byte is normally not used as terminator since that does not correspond to the ASCII text standard, and the length is usually not stored, since the file should be human editable without bugs.
From the en.wikipedia.org
The ASCII character set is the most common format for English-language text files, and is generally assumed to be the default file format in many situations.
From the en.wikipedia.org
Text was once commonly encoded in ASCII, using 8 bits for one letter or other character, encoding 7 bits, allowing 128 values, and using the 8th as a checksum bit when transferring a file.