The Observations at Spec Pressure, Observations at Specified Flows, Observations at Specified Conc/Temp, Observations at Generalized Flow, and Observations at Generalized Transport panes are only visible for objects evaluated at nodes if PEST has been activated and one or more SUTRA observations of the corresponding type have been defined in the Manage SUTRA Boundary Observations dialog box.
Each such observation group is listed in a table on the pane. If the current object is a part of that observation group, a check box is checked next to the name of the observation group. If the current object also defines a boundary of the corresponding type, the user can add or remove the object from the observation group by checking or unchecking the checkbox next to the observation group name.
The Factor for a particular object can also be defined in the table. The factor should evaluate to be between 0 and 1 inclusive. It determines how much of the flux through each node is included in the simulated value.