6.2 Pure Parallels

Pure parallel proposals are identified by the Proposal Category (see Section 2.3.1 Proposal Information [Proposal_Information] on page 13). All visits in such proposals will be interpreted as pure parallel visits.

Instrument Configuration

Pure parallel exposures are limited to the following instrument configurations and modes:

Configuration	Operating Mode
ACS/WFC	ACCUM
WFC3/UVIS	ACCUM
WFC3/IR	MULTIACCUM

Every exposure in a pure parallel proposal must use the same instrument.

Special Requirements

No visit-level or exposure special requirements are allowed in pure-parallel visits.

Exposure Containers

In pure-parallel visits you can use the following container (see Section 5.18, “Exposure Containers: Exposure Groups, Coordinated Parallels and Patterns,” on page 101):

•	Exposure Group Container (Type: Sequence)

•	Coordinated Parallel Container For example, a pure parallel Visit may include an exposure using WFC3/IR and a coordinated exposure using ACS/WFC.