The data is a single-precision, floating-point, binary number. If you specify end in the POSITION clause, then end is ignored. The length of the field is the length of a single-precision, floating-point binary number on your system. (The data type is FLOAT in C.) This length cannot be overridden in the control file.
FLOAT can be loaded with correct results only between systems where the representation of FLOAT is compatible and of the same length. If the byte order is different between the two systems, then use the appropriate technique to indicate the byte order of the data. See "Byte Ordering".