function ii = config1_ind(instclass)
% returns a structure with the index names for configuration_1

ii.avg_interval   = 1;
ii.compensation   = 2;
ii.num_bins       = 3;
ii.tr_depth       = 4;
ii.bin_length     = 5;
ii.pls_length     = 6;
ii.blank_length   = 7;
ii.ping_interval  = 8;
ii.bot_track      = 9;
ii.pgs_ensemble   = 10;
ii.ens_threshold  = 11;
ii.ev_threshold   = 12;
ii.hd_offset      = 13;
ii.pit_offset     = 14;
ii.rol_offset     = 15;
ii.unused1        = 16;
ii.unused2        = 17;
ii.unused3        = 18;
ii.freq_transmit  = 19;
ii.top_ref_bin    = 20;
ii.bot_ref_bin    = 21;
ii.unused4        = 22;
ii.heading_bias   = 23;

return

