Baseline negation operator

The negation operator '!' can be used to exclude a baseline specification from the final selection. Note that this is a baseline negation operator and not an antenna negation operator. The negation operator applies only to the baseline specification immediately following it. E.g.,

• baseline=!15 excludes all baselines with the antenna named "15"
• baseline=!1$\sim$ 10 excludes all baselines involving the antennas named between "1" and "10"
• baseline=!1,3,5,7,9 excludes all baselines involving antennas named "1", "3", "5", "7" and "9"
• baseline=1$\sim$ 10;!5 selects all baselines involving antennas named between "1" and "10" except those involving antenna named "5".

Note that the negation operator cannot be applied to individual members of the antenna specification/antenna list. E.g. the expression "1,2,!5,8" is syntactically incorrect.