Section 11,60: LOG10

 LOG10 (number)

 A function that returns the common log (base 10) of the argument.
 The argument must be greater than zero.
 +------+---------+----------+------------+-------------+        
 | Args | Generic | Specific |  Argument  | Result Type |
 +------+---------+----------+------------+-------------+
 |  1   |  LOG10  | ALOG10   | REAL*4     | REAL*4      |
 |      |         | DLOG10   | REAL*8     | REAL*8      |
 |      |see note | QLOG10   | REAL*16    | REAL*16     |
 +------+---------+----------+------------+-------------+

 NOTE: QLOG10 is not available in DEC Fortran.

 The argument for ALOG10, DLOG10, and QLOG10 must be greater than
 zero.