# clean parity reference (larch index_of/index_nearest)
grid 7000 7002.5 7005 7007.5 7010 7012.5 7015 7017.5 7020 7022.5 7025 7027.5 7030 7032.5 7035 7037.5 7040 7042.5 7045 7047.5 7050 7052.5 7055 7057.5 7060 7062.5 7065 7067.5 7070 7072.5 7075 7077.5 7080 7082.5 7085 7087.5 7090 7092.5 7095 7097.5 7100 7102.5 7105 7107.5 7110 7112.5 7115 7117.5 7120 7122.5 7125 7127.5 7130 7132.5 7135 7137.5 7140 7142.5 7145 7147.5 7150 7152.5 7155 7157.5 7160 7162.5 7165 7167.5 7170 7172.5 7175 7177.5 7180 7182.5 7185 7187.5 7190 7192.5 7195 7197.5 7200
probes 6990 7000 7001 7001.5 7099.8999999999996 7100 7123.75 7200 7210
index_of 0 0 0 0 39 40 49 80 80
index_nearest 0 0 0 1 40 40 49 80 80