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In an interval table, each interval is stored as its own row, and information about that interval is stored in fields, or columns, in that row. To create, modify, or delete fields in a Petra project, select the Maintenance button on the bottom of the Interval tab on the Main Module.
 - This option adds a new interval field to the selected interval data table. Selecting this option brings up a dialogue box to add the new fields name, description, and attributes. The Kind dropdown box sets the kind of data the interval field stores: a Real Field, Date Field, or String Field. Real Fields simply store numbers, such as porosity or permeability. Dates store calendar days as MM/DD/YYYY. String values store text like core descriptions. For Real fields, the Units box sets the displayed units of measurement, while the Decimal Places for Display option sets the displayed trailing decimals.
 - This option modifies the name, description and attributes of the selected field.
 - This option deletes the selected field.
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