:term:`FOLLOW_VECTOR <FOLLOW_VECTOR (DETCI)>`
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      In following a particular root (see :term:`FOLLOW_ROOT <FOLLOW_ROOT (DETCI)>` , sometimes the root number changes. To follow a root of a particular character, one can specify a list of determinants and their coefficients, and the code will follow the root with the closest overlap. The user specifies arrays containing the absolute alpha string indices (A_i below), absolute beta indices (B_i below), and CI coefficients (C_i below) to form the desired vector. The format is FOLLOW_VECTOR = [ [[A_1, B_1], C_1], [[A_2, B_2], C_2], ...]. 

      * **Type**: array
      * **Default**: No Default

