Section 10,27: SP

 (Always + Signs)

 Causes the processor to produce a leading plus character (+) in any
 position where this character would otherwise be optional.

 This descriptor affects all (suppress + signs) fields that follow
 it, until an S or SS is encountered.  The SP descriptor affects all
 subsequent I, F, E, D, and G editing (in the same FORMAT statement)
 during the execution of an output statement.