86 1001
Rowland, F.S.
UCI
DC-8 Grab_Samples_GC
AASE II
1 1
1992 01 22 1993 07 13
0
Sample start time in UT seconds
35
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 
99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999 99999
Stop_Time;_GMT_(seconds)
Sample_Midpoint;_GMT_(seconds)
CFC_115;_(pptv)
CF3BR;_(pptv)
CFC-22;_(pptv)
CH3CL;_(pptv)
CFC-114;_(pptv)
CBRCLF2;_(pptv)
CH3BR;_(pptv)
CFC-11;_(pptv)
CFC-113;_(pptv)
CHCL3;_(pptv)
CH3CCL3;_(pptv)
CCL4;_(pptv)
C2HCL3;_(pptv)
C2CL4;_(pptv)
ETHANE;_(pptv)
ETHENE;_(pptv)
PROPANE;_(pptv)
PROPENE;_(pptv)
i_BUTANE;_(pptv)
n_BUTANE;_(pptv)
ETHYNE;_(pptv)
t_2_BUTENE;_(pptv)
1_BUTENE;_(pptv)
i_PENTANE;_(pptv)
n_PENTANE;_(pptv)
1_3_BUTADIENE;_(pptv)
PROPYNE;_(pptv)
1_PENTENE;_(pptv)
2_BUTYNE;_(pptv)
1_BUTYNE;_(pptv)
BENZENE;_(pptv)
TOLUENE;_(pptv)
CFC-12;_(pptv)
0
35 (# of comment lines below)
Measurement below the detection limit are indicated by 0.
The detection limits in pptv are:
CFC_115 = 0.1; Accuracy +/- 25%; Measurment precision (M1-9) 25% (M10-19) 2%
CF3BR = 0.1; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
CFC-22 = 1; Accuracy +/- 10%; Measurment precision (M1-9) 15% (M10-19) 2%
CH3CL = 10; Accuracy +/- 5%; Measurment precision (M1-9) 10% (M10-19) 3%
CFC-114 = 0.1; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
CBRCLF2 = 0.01; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
CH3BR = 0.5; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
CFC-11 = 1; Accuracy +/- 5%; Measurment precision (M1-9) 5% (M10-19) 2%
CFC-113 = 1; Accuracy +/- 5%; Measurment precision (M1-9) 10% (M10-19) 2%
CHCL3 = 0.5; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
CH3CCL3 = 1; Accuracy +/- 10%; Measurment precision (M1-9) 10% (M10-19) 2%
CCL4 = 1; Accuracy +/- 10%; Measurment precision (M1-9) 10% (M10-19) 2%
C2HCL3 = 0.1; Accuracy +/- 25%; Measurment precision (M1-9) 10% (M10-19) 2%
C2CL4 = 0.01; Accuracy +/- 10%; Measurment precision (M1-9) 10% (M10-19) 2%
ETHANE = 2; Accuracy +/- 10%; Measurment precision (all) 3%
ETHENE = 2; Accuracy +/- 25%; Measurment precision (all) 3%
PROPANE = 2; Accuracy +/- 10%; Measurment precision (all) 3%
PROPENE = 2; Accuracy +/- 25%; Measurment precision (all) 5%
i_BUTANE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
n_BUTANE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
ETHYNE = 2; Accuracy +/- 10%; Measurment precision (all) 3%
t_2_BUTENE = 2; Accuracy +/- 25%; Measurment precision (all) 5%
1_BUTENE = 2; Accuracy +/- 25%; Measurment precision (all) 5%
i_PENTANE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
n_PENTANE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
1_3_BUTADIENE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
PROPYNE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
1_PENTENE = 2; Accuracy +/- 25%; Measurment precision (all) 5%
2_BUTYNE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
1_BUTYNE = 2; Accuracy +/- 10%; Measurment precision (all) 5%
BENZENE = 2; Accuracy +/- 15%; Measurment precision (all) 5%
TOLUENE = 2; Accuracy +/- 15%; Measurment precision (all) 5%
CFC_12 = 1; Accuracy +/- 5%; Measurment precision (M1-9) 5% (M10-19) 2%
39950 39990 39970 2.7 3.22 108.4
598 9.93 1.89 8.94 262.9 79.6
6.76 149.9 105.6 1.08 0.107 1171.9
42.2 308.7 14.5 38.6 79.4 268.2
0 0 13.9 10.5 0 0
0 0 0 13.5 2.7 484.2
41090 41140 41115 3.06 2.87 133.4
515.7 9.45 1.55 99999 228.5 99999
99999 99999 99999 99999 99999 222.5
10.6 3.5 8.9 3.3 0 9.1
0 0 0 0 0 0
0 0 0 0 0 462
41955 42010 41982 2.52 3.05 104.3
548.2 9.79 1.67 99999 239.7 99999
99999 99999 99999 99999 99999 353.3
11.5 9.9 8 0 3.1 28.1
0 0 0 0 0 0
0 0 0 4.6 0 472.4
42855 42910 42882 99999 2.85 116.7
555.4 9.72 1.61 7.39 243.9 73.7
2.24 119.2 94.5 2.23 0.76 193.1
99999 4.8 99999 0 2.9 10.9
0 0 0 0 0 0
0 0 0 3.7 0 466.1
43760 43820 43790 2.71 2.75 138
500.9 9.24 1.43 99999 220 99999
99999 99999 99999 99999 99999 113.1
12.2 0 7 0 0 6.2
0 0 0 0 0 0
0 0 0 0 0 454.6
44540 44590 44565 2.19 3.17 106.9
558.6 9.94 1.75 5.04 244.1 69.4
2.45 102.8 84.1 0.76 1.576 542.7
10.4 54.9 3.5 0 5.3 66.8
0 0 0 0 0 0
0 0 0 14 0 475.5
44625 44670 44647 2.44 3.15 101.5
603 9.91 1.85 8.7 257.9 78.6
5.18 142.8 101.8 1.42 0.724 768.6
33.4 145.9 28.7 12.4 23.8 132.8
0 0 5.2 2.6 0 0
0 0 0 4.4 7.6 482
44710 44750 44730 99999 3.23 108.7
577.9 9.97 1.87 6.82 256.4 77
4.74 139.9 100.6 0.54 8.462 1051.5
17.4 265.7 4.8 23.1 54.8 209
0 0 6 4.8 0 0
0 0 0 8.1 0 488.3
44870 44910 44890 2.5 3.4 115.8
592.9 10.27 1.95 8.57 257.2 76.7
5.4 130.2 96.5 1.61 11.366 1354.5
23.2 374.8 5.3 41.3 92.4 282.1
0 0 17.3 12.7 0 0
0 0 0 14.4 0 489.6
45520 45545 45532 2.64 3.35 113.4
603.4 10.25 1.98 8.97 265.3 81.8
8.62 157.8 106.4 4.98 20.84 1509.9
48.1 478.4 28.2 82.7 153.5 392.7
0 0 48.8 39 0 2.6
0 0 0 55.6 0 492.5
45615 45640 45627 99999 3.34 109.1
583.2 10.04 1.94 8.62 260.4 80.1
8.47 151.2 105.2 6.77 20.83 1512.7
44.4 492 8.2 87.3 168.1 387.3
0 0 53.3 39.6 0 3
0 0 0 64.1 4.1 491.5
45690 45715 45702 2.38 3.45 138.2
576.3 10.47 2.02 8.8 260.2 82
9.16 158.8 106.3 10.09 24.916 1929
71.6 793.7 5.9 146 310 489.1
0 0 98.1 73.1 0 4.2
0 0 0 72.1 10.7 490.2
45800 45820 45810 2.32 3.42 113.6
577 10.36 2.01 8.83 264.9 83.1
9.2 165.7 107.7 1.92 28.692 2063.9
117.8 896.2 25.5 181.6 379.8 523.6
0 0 141.2 100.9 0 5.2
0 0 0 93.1 22.8 493.2
46355 46375 46365 2.27 3.37 115.6
578 10.3 2.02 8.43 264.3 81.1
8.44 154.7 107.2 13.79 27.581 1997.9
102.6 871.7 12.2 173 367.3 509.5
0 0 135.5 95.4 0 5.3
0 0 0 87.1 14.7 494
46485 46515 46500 2.18 3.4 112.7
569.5 10.14 1.99 8.71 261.3 81
9.04 153.1 105.5 9.98 26.219 2045.7
110.9 912.2 6.5 182.6 384.8 520.7
0 0 135.6 97.4 0 4.1
0 0 0 85.3 14 490.4
46545 46575 46560 2.22 3.36 112
572.8 10.08 1.95 8.72 264.1 81.8
8.21 156.6 105.4 8.41 22.224 1578.4
75.5 609.6 15.9 113.4 239.2 390
0 0 84.1 58.6 0 3.1
0 0 0 66.4 7.6 491.9
46600 46640 46620 2.14 3.35 118.6
575.7 10.21 2.01 8.76 261.1 80.9
8.99 153.7 106.7 10.06 26.868 1957.7
92.4 826.8 12.1 158.5 335 483.3
0 0 119.1 83.6 0 4.2
0 0 0 84.2 15.7 492.3
46640 46680 46660 1.99 3.4 116.3
578.6 10.09 1.97 8.67 261.1 81
9.06 155.3 106.1 9.05 25.942 1958.1
81.4 815.4 11.1 154.1 326.7 471.9
0 0 108.8 80.5 0 3.7
0 0 0 90.7 17.5 488.9
46695 46735 46715 2.25 3.41 111.1
582 10.18 1.98 8.72 260.8 80.1
8.48 156 105.7 7.36 24.51 1800.2
83.3 707.4 13.2 123.9 276.3 427.4
0 0 89.4 57.1 0 3.1
0 0 0 56.4 0 491.9
46745 46785 46765 2.52 3.34 124.8
572.6 10.19 1.99 8.3 256.8 79.6
8.05 149.1 103.4 4.2 21.712 1652.1
73.7 594.8 8.9 104.7 221.3 382.5
0 0 64.9 43 0 0
0 0 0 43.5 4.7 489.7
46795 46840 46817 2.04 3.27 113.6
590.7 10.1 1.94 8.59 257.3 78.3
6.61 135.4 99.5 2.35 15.205 1404.5
38.2 435.5 7 60 131.1 322.9
0 0 29 19.1 0 0
0 0 0 23.6 0 490.2
46850 46900 46875 2.54 3.24 108.5
586.2 10.09 1.9 8.72 258.9 80.2
7.56 147.3 105.3 2.66 14.743 1072.1
31.8 289.9 11.7 42.4 88.7 216.7
0 0 23.5 17.2 0 0
0 0 0 27.4 2.3 488.1
46925 46975 46950 2.24 3.33 114
573.9 10.19 2 8.35 254.7 80.1
8.35 153.2 107.2 13.79 27.581 742.9
28.5 144.5 14.1 16.9 31.8 138.5
0 0 7.7 3.3 0 0
0 0 0 7.4 2.5 490.1
47000 47055 47027 2.12 3.17 107.4
580.4 9.96 1.82 7.77 249.6 74.5
4.04 120 95 0.53 4.855 725
16.7 122.8 8 9.7 17.6 126.1
0 0 0 0 0 0
0 0 0 2.8 0 482.5
47110 47180 47145 2.23 3.12 102.4
579 9.95 1.79 99999 244.3 99999
99999 99999 99999 99999 99999 536.7
22 64.5 8.3 3.8 5.9 74.4
0 0 0 0 0 0
0 0 0 2.3 0 473.4
47295 47360 47327 99999 2.91 98
542.7 9.6 1.59 99999 230.2 99999
99999 99999 99999 99999 99999 220.9
99999 7.4 99999 2.6 3.1 14.9
0 0 0 0 0 0
0 0 0 3.5 0 468.2
47505 47575 47540 99999 2.89 97.4
548 9.65 1.59 99999 237 99999
99999 99999 99999 99999 99999 198.4
11.4 4.7 6.7 0 0 16.6
0 0 0 0 0 0
0 0 0 2.2 0 464
48375 48435 48405 2.41 3.05 99.2
564.8 9.68 1.66 99999 238.7 99999
99999 99999 99999 99999 99999 356.2
8.8 24.4 3.3 0 0 40.2
0 0 0 0 0 0
0 0 0 2.5 0 469.8
49315 49375 49345 2.67 2.98 96.7
557.6 9.73 1.66 5.64 237.6 74.3
3.34 122.1 93.5 0.26 1.327 278.1
99999 16.5 99999 0 3.1 27.5
0 0 0 0 0 0
0 0 0 99999 0 474.1
51100 51170 51135 2.06 3.03 99.1
558.8 9.74 1.67 99999 238.9 99999
99999 99999 99999 99999 99999 356.1
8.8 18.9 5.3 0 2.7 36
0 0 0 0 0 0
0 0 0 0 0 477.4
51740 52105 51922 99999 2.93 96.8
534.7 9.62 1.58 99999 228.4 99999
99999 99999 99999 99999 99999 223
99999 6.5 99999 0 2.2 14.7
0 0 0 0 0 0
0 0 0 2.7 0 464.1
53070 53140 53105 99999 2.9 95.9
531.5 9.62 1.54 99999 230.6 99999
99999 99999 99999 99999 99999 217.5
9.2 6.3 4 0 0 9.8
0 0 0 0 0 0
0 0 0 2.5 0 459.9
53965 54035 54000 1.9 2.9 91.8
528.8 9.6 1.55 99999 237.4 99999
99999 99999 99999 99999 99999 225.5
6.4 7.5 0 0 0 11.7
0 0 0 0 0 0
0 0 0 0 0 472
54950 55020 54985 2.09 3.05 99.1
560.5 9.82 1.69 4.23 240.6 75.1
2.58 121.6 52.9 1.74 1.111 319.1
99999 9.9 99999 0 2.6 18.5
0 0 0 0 0 0
0 0 0 99999 0 475.3
55785 55855 55820 2.12 2.91 96.7
536.1 9.63 1.54 99999 229.7 99999
99999 99999 99999 99999 99999 209
9.3 4.7 6.1 0 0 12.9
0 0 0 0 0 0
0 0 0 0 0 458.9
56670 56445 56557 1.98 2.86 94.7
529.5 9.52 1.52 99999 226.9 99999
99999 99999 99999 99999 99999 168.7
2.4 4 0 0 0 8.4
0 0 0 0 0 0
0 0 0 2.7 0 456.9
57540 57610 57575 2.25 2.87 97.3
537.1 9.62 1.54 99999 221.4 99999
99999 99999 99999 99999 99999 185
99999 4.1 99999 0 0 13.3
0 0 0 0 0 0
0 0 0 99999 0 457.2
58485 58555 58520 99999 2.8 95
525 9.64 1.49 99999 229.8 99999
99999 99999 99999 99999 99999 135.4
9.7 0 5.3 0 0 8.8
0 0 0 0 0 0
0 0 0 2.3 0 460.2
59398 59470 59434 99999 2.79 91.2
521.1 9.5 1.47 99999 221.1 99999
99999 99999 99999 99999 99999 140.1
10.2 4 8.7 0 0 8.6
0 0 0 0 0 0
0 0 0 0 0 454.4
60310 60380 60345 99999 2.73 92.3
524.9 9.4 1.44 99999 213.9 99999
99999 99999 99999 99999 99999 110
99999 4 99999 2.1 2.7 10.8
0 0 0 0 0 0
0 0 0 99999 0 451.6
61200 61270 61235 99999 2.79 97.9
536.5 9.59 1.49 4.18 228.8 69.8
0.55 104.5 85 0.18 0.117 118.7
9 2.6 3.5 0 0 10.3
0 0 0 0 0 0
0 0 0 3.4 0 459
62000 62070 62035 99999 2.84 96.2
513.4 9.55 1.47 99999 223.2 99999
99999 99999 99999 99999 99999 139.6
7.6 4.2 4.5 0 0 9.1
0 0 0 0 0 0
0 0 0 0 0 458.1
62290 62360 62325 2.12 2.77 93.6
534.5 9.51 1.47 99999 215.8 99999
99999 99999 99999 99999 99999 127.9
99999 3.2 99999 0 3.7 11.8
0 0 0 0 0 0
0 0 0 99999 0 453.7
62865 62935 62900 2.34 2.69 95
507.9 9.32 1.37 99999 216.5 99999
99999 99999 99999 99999 99999 83
9.8 3.3 7.4 0 2.8 3.7
0 0 0 0 0 0
0 0 0 2.6 0 447.1
63735 63805 63770 99999 2.98 99.3
545 9.67 1.59 99999 232.7 99999
99999 99999 99999 99999 99999 229
8.5 4.5 5.9 0 0 14.4
0 0 0 0 0 0
0 0 0 0 0 466.5
64495 64565 64530 1.94 2.62 89.3
502.7 9.3 1.32 99999 208.1 99999
99999 99999 99999 99999 99999 82.5
99999 2.4 99999 0 0 4.6
0 0 0 0 0 0
0 0 0 99999 0 445
64670 64745 64707 2.12 2.37 85.1
439.9 8.85 1.09 99999 191.1 99999
99999 99999 99999 99999 99999 23.1
8.6 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 419.4
64855 64940 64897 99999 99999 99999
99999 97999.02 99999 99999 99999 99999
99999 99999 99999 99999 99999 41.3
99999 6.1 99999 0 3.6 0
0 0 0 3.3 0 0
0 0 0 99999 0 99999
65324 65395 65359 2.6 2.46 85.1
459 8.83 1.13 99999 194.8 99999
99999 99999 99999 99999 99999 33.7
4.8 2.4 5.7 2.6 0 3.9
0 0 0 0 0 0
0 0 0 3.2 0 425.2
65510 65585 65547 2.97 2.72 86.9
467.9 9.37 1.38 99999 211.9 99999
99999 99999 99999 99999 99999 129.8
11.9 3.6 6.2 0 2.7 3.6
0 0 0 0 0 0
0 0 0 3.1 0 446.6
65595 65615 65605 1.93 2.7 89.5
513.1 9.34 1.41 99999 223.6 99999
99999 99999 99999 99999 99999 144.4
99999 3.4 99999 0 0 9.4
0 0 0 0 0 0
0 0 0 99999 0 451.5
65685 65765 65725 99999 2.82 92.2
513.3 9.56 1.47 99999 226.1 99999
99999 99999 99999 99999 99999 172.9
8.5 4.4 0 0 0 12.3
0 0 0 0 0 0
0 0 0 4.3 0 455
65775 65860 65817 2.2 2.8 94.9
519.8 9.39 1.44 99999 220.3 99999
99999 99999 99999 99999 99999 159.7
8 4.4 5.5 0 0 9.8
0 0 0 0 0 0
0 0 0 3.3 0 454.2
65865 65960 65912 1.85 2.75 93.3
531.6 9.37 1.47 4.28 229.1 99999
1.98 116.2 78.8 0.32 0.691 169.8
99999 7.7 99999 0 0 12.9
0 0 0 0 0 0
0 0 0 3.9 0 456.4
65970 66060 66015 99999 2.81 91.6
523.6 9.45 1.45 99999 231 99999
99999 99999 99999 99999 99999 152.1
10.7 3.6 0 0 0 12.7
0 0 0 0 0 0
0 0 0 0 0 456.1
66065 66190 66127 2.87 2.83 92.6
510.9 9.38 1.45 99999 223.5 99999
99999 99999 99999 99999 99999 163.3
11.5 3.5 4.3 0 0 9.8
0 0 2.6 0 0 0
0 0 0 2.5 0 455.1
66290 66370 66330 99999 2.8 90.8
538.7 9.43 1.51 6.84 233.8 99999
3.07 121.2 87.5 0.42 0.14 183.8
99999 7.1 99999 0 3.2 14.4
0 0 5.3 2.2 0 0
0 0 0 7.3 0 460.4
66615 66695 66655 2.48 2.88 94.6
526 9.63 1.55 99999 235 99999
99999 99999 99999 99999 99999 201
6.6 0 3.8 0 0 9.2
0 0 0 0 0 0
0 0 0 2.2 0 462.7
67405 70520 68962 2.4 2.95 100.9
512 9.56 1.56 99999 239.2 99999
99999 99999 99999 99999 99999 258.4
8.6 5.5 6.5 0 0 7.4
0 0 0 0 0 0
0 0 0 3.1 0 463.8
67695 67810 67752 3 2.99 100
551.2 9.76 1.59 99999 241.4 99999
99999 99999 99999 99999 99999 267.7
99999 7.2 99999 0 0 16.7
0 0 0 0 0 0
0 0 0 3.7 0 471.1
68630 68740 68685 1.63 2.75 92.4
487.2 9.34 1.42 99999 225.9 99999
99999 99999 99999 99999 99999 157
5.6 3.3 5.4 0 0 5.8
0 0 0 0 0 0
0 0 0 2.2 0 453.9
71170 71280 71225 2.82 3.15 100.2
555.1 9.92 1.73 99999 252.3 99999
99999 99999 99999 99999 99999 371.7
7.1 8.1 4.3 0 0 21.2
0 0 0 0 0 0
0 0 0 2.3 0 475.8
71625 71740 71682 2.4 2.85 93.9
528.6 9.63 1.51 99999 233.2 99999
99999 99999 99999 99999 99999 203.4
99999 5.1 99999 0 0 14.2
0 0 0 0 0 0
0 0 0 2.7 0 458.3
73090 73165 73127 3.27 3.24 88.3
604.7 10.14 1.85 99999 266.3 99999
99999 99999 99999 99999 99999 809.4
7.7 127.6 4.9 8.9 18.1 107.2
0 0 0 0 0 0
0 0 0 99999 0 488.6
73695 73770 73732 3.18 3.31 107.1
594.7 10.42 2.02 8.82 261.2 99999
7.5 151 104.3 3.94 1.495 1155.6
30.1 257.8 13.7 38.4 72.1 253
0 0 24.3 18.3 0 0
0 0 0 53.8 17.9 490.5
73900 73945 73922 2.54 3.41 105
612.5 10.34 1.96 8.51 265.1 99999
7.39 152.5 99.1 4.44 17.861 1295.3
44 320 99999 44.2 82 299.8
0 0 24.6 18.2 0 0
0 0 0 99999 0 490.7
75050 75085 75067 3.12 3.34 104.4
604.7 10.21 1.94 8.67 267.5 99999
7.92 149.8 107.3 1.42 17.764 1341.1
14.1 342.8 5.9 52.3 92.3 309.7
0 0 25.4 20.8 0 2.5
0 0 0 60 2.6 492.8
75180 75215 75197 2.66 3.35 96.7
604.4 10.16 1.94 8.91 263.7 99999
7.13 150.8 107.2 4.87 69.523 1267.8
15.9 287.8 5.2 41.3 73.1 307.5
0 0 19.6 16.6 0 0
0 0 0 65.3 5.9 489.9
75295 75320 75307 99999 99999 99999
99999 97999.02 99999 99999 99999 99999
99999 99999 99999 99999 99999 1553.3
42.7 476 8.9 81.6 155.9 411.3
0 0 50.9 38.4 0 2.8
0 0 0 78.8 15 99999
76215 76235 76225 2.59 3.49 108.2
587.5 10.34 2.02 8.09 271.7 99999
9.41 156.7 99.6 14.76 25.867 1984.6
113 864.5 4 189.2 371.2 583
0 4.2 147.6 120.7 0 6.9
0 0 0 116.2 17 493
76385 76405 76395 2.92 3.42 97.9
586.4 10.26 1.98 8.99 262.2 99999
9.08 157.4 105.3 15.88 121.41 1884.3
116.2 743.9 7.4 159.5 309.1 552.8
0 3.9 126.4 101.5 0 6.3
0 0 0 131.1 45.2 490