Sigil of Aether (Marvel)

Rosetta · #ROS168

Sigil of Aether (Marvel) — Rosetta

Sigil of Aether (Marvel)

TCGPlayer · US market · Cold FoilUS$126.67USD market referenceUpdated 22 Oct 2026
SetRosetta
NumberROS168
RarityMarvel
Set CodeROS
Print Type

Sigil of Aether (Marvel)

TCGPlayer · US market · Cold FoilUS$126.67USD market referenceUpdated 22 Oct 2026
▼1.77%historical change

Ungraded card references. Condition and selling costs affect what you receive; graded slab values are not covered.

Sigil of Aether (Marvel) #ROS168 from Rosetta (Cold Foil): TCGPlayer US-market reference US$126.67, updated 22 Oct 2026. Source currency: USD.

What does this price mean?

TCGPlayer is a US-market reference in USD. Cardmarket uses a Non-foil guide · EUR source, converted from EUR to USD; it is not UK-only pricing. Prices refer to the displayed printing. Your card's condition, language, grading and selling costs can affect what you receive.

US market price history · 19 Sept 2024 – 23 Oct 2026
725 recorded price points. Change compares the first and last points shown.

View recorded prices as a table
US market-price observations in USD · Cold Foil
DateMarket price
19 Sept 2024$128.95
20 Sept 2024$80.85
21 Sept 2024$79.81
22 Sept 2024$59.75
23 Sept 2024$56.33
24 Sept 2024$61.55
25 Sept 2024$56.93
26 Sept 2024$55.73
27 Sept 2024$55.73
28 Sept 2024$55.73
29 Sept 2024$54.73
30 Sept 2024$54.73
1 Oct 2024$53.97
2 Oct 2024$53.97
3 Oct 2024$53.97
4 Oct 2024$53.97
5 Oct 2024$53.97
6 Oct 2024$53.22
7 Oct 2024$53.22
8 Oct 2024$53.22
9 Oct 2024$53.22
10 Oct 2024$53.22
11 Oct 2024$50.94
12 Oct 2024$50.94
13 Oct 2024$49.95
14 Oct 2024$47.91
15 Oct 2024$47.67
16 Oct 2024$47.67
17 Oct 2024$47.67
18 Oct 2024$47.40
19 Oct 2024$47.40
20 Oct 2024$47.67
21 Oct 2024$47.67
22 Oct 2024$47.47
23 Oct 2024$47.47
24 Oct 2024$47.47
25 Oct 2024$47.30
26 Oct 2024$47.30
27 Oct 2024$47.30
28 Oct 2024$47.30
29 Oct 2024$47.30
30 Oct 2024$46.91
31 Oct 2024$47.09
1 Nov 2024$47.09
2 Nov 2024$47.09
3 Nov 2024$47.09
4 Nov 2024$47.09
5 Nov 2024$46.95
6 Nov 2024$46.95
7 Nov 2024$46.95
8 Nov 2024$46.95
9 Nov 2024$46.95
10 Nov 2024$46.95
11 Nov 2024$46.95
12 Nov 2024$46.95
13 Nov 2024$46.95
14 Nov 2024$46.95
15 Nov 2024$46.95
16 Nov 2024$46.95
17 Nov 2024$46.95
18 Nov 2024$46.95
19 Nov 2024$46.95
20 Nov 2024$46.82
21 Nov 2024$46.82
22 Nov 2024$46.82
23 Nov 2024$46.82
24 Nov 2024$46.82
25 Nov 2024$46.82
26 Nov 2024$44.54
27 Nov 2024$44.54
28 Nov 2024$44.54
29 Nov 2024$43.81
30 Nov 2024$43.62
1 Dec 2024$43.62
2 Dec 2024$43.62
3 Dec 2024$43.62
4 Dec 2024$43.62
5 Dec 2024$43.62
6 Dec 2024$43.62
7 Dec 2024$43.62
8 Dec 2024$43.17
9 Dec 2024$43.17
10 Dec 2024$43.17
11 Dec 2024$43.17
12 Dec 2024$43.17
13 Dec 2024$43.17
14 Dec 2024$43.17
15 Dec 2024$43.27
16 Dec 2024$43.57
17 Dec 2024$43.57
18 Dec 2024$43.57
19 Dec 2024$43.57
20 Dec 2024$43.57
21 Dec 2024$43.57
22 Dec 2024$43.57
23 Dec 2024$43.57
24 Dec 2024$43.57
25 Dec 2024$43.57
26 Dec 2024$43.87
27 Dec 2024$43.87
28 Dec 2024$43.87
29 Dec 2024$43.87
30 Dec 2024$43.76
31 Dec 2024$43.76
1 Jan 2025$43.76
2 Jan 2025$43.76
3 Jan 2025$43.68
4 Jan 2025$43.68
5 Jan 2025$43.68
6 Jan 2025$43.68
7 Jan 2025$43.68
8 Jan 2025$43.71
9 Jan 2025$43.71
10 Jan 2025$43.70
11 Jan 2025$43.70
12 Jan 2025$43.70
13 Jan 2025$43.67
14 Jan 2025$43.67
15 Jan 2025$43.67
16 Jan 2025$43.67
17 Jan 2025$43.64
18 Jan 2025$43.64
19 Jan 2025$43.64
20 Jan 2025$43.64
21 Jan 2025$43.64
22 Jan 2025$43.64
23 Jan 2025$43.64
24 Jan 2025$43.64
25 Jan 2025$43.64
26 Jan 2025$43.64
27 Jan 2025$43.64
28 Jan 2025$43.64
29 Jan 2025$43.64
30 Jan 2025$43.64
31 Jan 2025$43.64
1 Feb 2025$43.64
2 Feb 2025$43.64
3 Feb 2025$43.64
4 Feb 2025$43.64
5 Feb 2025$43.54
6 Feb 2025$43.54
7 Feb 2025$43.54
8 Feb 2025$43.54
9 Feb 2025$43.54
10 Feb 2025$43.54
11 Feb 2025$43.54
12 Feb 2025$43.46
13 Feb 2025$43.46
14 Feb 2025$43.28
15 Feb 2025$43.28
16 Feb 2025$43.28
17 Feb 2025$43.28
18 Feb 2025$43.28
19 Feb 2025$43.28
20 Feb 2025$43.28
21 Feb 2025$43.28
22 Feb 2025$43.33
23 Feb 2025$43.09
24 Feb 2025$43.44
25 Feb 2025$43.44
6 Mar 2025$45.27
8 Mar 2025$47.57
9 Mar 2025$47.57
10 Mar 2025$47.57
11 Mar 2025$47.57
12 Mar 2025$47.57
13 Mar 2025$47.57
14 Mar 2025$47.57
15 Mar 2025$49.87
16 Mar 2025$49.87
17 Mar 2025$49.87
18 Mar 2025$50.73
19 Mar 2025$50.73
20 Mar 2025$50.73
21 Mar 2025$50.73
22 Mar 2025$50.73
23 Mar 2025$50.73
24 Mar 2025$50.73
25 Mar 2025$50.73
26 Mar 2025$50.73
27 Mar 2025$50.73
28 Mar 2025$50.73
29 Mar 2025$50.73
30 Mar 2025$50.73
31 Mar 2025$50.73
1 Apr 2025$50.73
2 Apr 2025$52.00
3 Apr 2025$52.00
4 Apr 2025$53.24
5 Apr 2025$57.62
7 Apr 2025$59.66
8 Apr 2025$59.66
9 Apr 2025$59.66
10 Apr 2025$59.66
11 Apr 2025$59.66
12 Apr 2025$59.66
13 Apr 2025$59.66
19 Apr 2025$61.13
20 Apr 2025$61.13
21 Apr 2025$61.13
22 Apr 2025$61.13
23 Apr 2025$61.13
24 Apr 2025$61.13
25 Apr 2025$61.13
26 Apr 2025$61.13
27 Apr 2025$61.13
28 Apr 2025$61.13
29 Apr 2025$62.46
30 Apr 2025$67.92
1 May 2025$67.92
2 May 2025$67.92
3 May 2025$67.92
4 May 2025$67.92
5 May 2025$67.92
6 May 2025$67.92
7 May 2025$67.92
8 May 2025$67.92
9 May 2025$72.29
10 May 2025$72.29
11 May 2025$72.29
12 May 2025$72.29
13 May 2025$72.29
14 May 2025$72.29
15 May 2025$72.29
16 May 2025$72.29
17 May 2025$72.29
18 May 2025$72.29
19 May 2025$72.29
20 May 2025$72.29
21 May 2025$72.29
22 May 2025$72.29
23 May 2025$72.29
24 May 2025$72.29
25 May 2025$72.29
26 May 2025$72.29
27 May 2025$72.29
28 May 2025$72.29
29 May 2025$72.29
30 May 2025$72.29
31 May 2025$72.29
1 Jun 2025$72.29
2 Jun 2025$72.29
3 Jun 2025$72.29
4 Jun 2025$72.29
5 Jun 2025$72.29
6 Jun 2025$72.29
7 Jun 2025$72.29
8 Jun 2025$72.29
9 Jun 2025$72.29
10 Jun 2025$72.29
11 Jun 2025$72.29
12 Jun 2025$72.29
13 Jun 2025$72.29
14 Jun 2025$72.29
15 Jun 2025$72.29
16 Jun 2025$72.29
17 Jun 2025$72.29
18 Jun 2025$72.29
19 Jun 2025$72.29
20 Jun 2025$72.29
21 Jun 2025$72.29
22 Jun 2025$74.19
23 Jun 2025$74.19
24 Jun 2025$74.19
25 Jun 2025$74.19
26 Jun 2025$74.19
27 Jun 2025$74.19
28 Jun 2025$74.19
29 Jun 2025$74.19
30 Jun 2025$74.19
1 Jul 2025$74.19
2 Jul 2025$76.11
3 Jul 2025$76.11
4 Jul 2025$76.11
5 Jul 2025$76.11
6 Jul 2025$78.03
7 Jul 2025$78.03
8 Jul 2025$78.03
9 Jul 2025$78.03
10 Jul 2025$78.03
11 Jul 2025$78.03
12 Jul 2025$78.03
13 Jul 2025$78.03
14 Jul 2025$78.03
15 Jul 2025$78.03
16 Jul 2025$78.03
17 Jul 2025$78.03
18 Jul 2025$78.03
19 Jul 2025$78.03
20 Jul 2025$78.03
21 Jul 2025$78.03
22 Jul 2025$78.03
23 Jul 2025$79.97
24 Jul 2025$79.97
25 Jul 2025$79.97
26 Jul 2025$79.97
27 Jul 2025$79.97
28 Jul 2025$79.97
29 Jul 2025$79.97
30 Jul 2025$79.97
31 Jul 2025$79.97
1 Aug 2025$79.97
2 Aug 2025$79.97
3 Aug 2025$79.97
4 Aug 2025$79.97
5 Aug 2025$79.97
6 Aug 2025$79.97
7 Aug 2025$79.97
8 Aug 2025$79.97
9 Aug 2025$79.97
10 Aug 2025$79.97
11 Aug 2025$79.97
12 Aug 2025$79.97
13 Aug 2025$79.97
14 Aug 2025$79.97
15 Aug 2025$79.97
16 Aug 2025$79.97
17 Aug 2025$83.39
18 Aug 2025$83.39
19 Aug 2025$83.39
20 Aug 2025$83.47
21 Aug 2025$83.47
22 Aug 2025$83.47
23 Aug 2025$83.47
24 Aug 2025$83.47
25 Aug 2025$83.47
26 Aug 2025$83.47
27 Aug 2025$83.47
28 Aug 2025$83.47
29 Aug 2025$83.47
30 Aug 2025$83.47
31 Aug 2025$83.47
1 Sept 2025$83.47
2 Sept 2025$83.11
3 Sept 2025$83.11
4 Sept 2025$83.11
5 Sept 2025$83.11
6 Sept 2025$83.11
7 Sept 2025$83.11
8 Sept 2025$83.11
9 Sept 2025$83.11
10 Sept 2025$83.11
11 Sept 2025$83.11
12 Sept 2025$82.41
13 Sept 2025$82.41
14 Sept 2025$83.17
15 Sept 2025$83.17
16 Sept 2025$83.17
17 Sept 2025$83.17
18 Sept 2025$83.17
19 Sept 2025$83.17
20 Sept 2025$83.17
21 Sept 2025$83.17
22 Sept 2025$83.17
23 Sept 2025$83.17
24 Sept 2025$83.17
25 Sept 2025$83.17
26 Sept 2025$83.53
27 Sept 2025$83.53
28 Sept 2025$83.53
29 Sept 2025$83.53
30 Sept 2025$83.90
1 Oct 2025$83.90
2 Oct 2025$84.89
3 Oct 2025$84.89
4 Oct 2025$84.44
5 Oct 2025$84.44
6 Oct 2025$84.44
7 Oct 2025$84.44
8 Oct 2025$84.44
9 Oct 2025$84.44
10 Oct 2025$84.44
11 Oct 2025$84.70
12 Oct 2025$84.70
13 Oct 2025$84.70
14 Oct 2025$84.70
15 Oct 2025$84.70
16 Oct 2025$84.70
17 Oct 2025$85.36
18 Oct 2025$85.36
19 Oct 2025$85.36
20 Oct 2025$83.50
21 Oct 2025$83.50
22 Oct 2025$83.50
23 Oct 2025$83.50
24 Oct 2025$83.50
25 Oct 2025$83.50
26 Oct 2025$83.50
27 Oct 2025$85.81
28 Oct 2025$85.81
29 Oct 2025$85.81
30 Oct 2025$85.81
31 Oct 2025$85.81
1 Nov 2025$86.42
2 Nov 2025$86.42
3 Nov 2025$86.42
4 Nov 2025$86.42
5 Nov 2025$86.42
6 Nov 2025$87.79
7 Nov 2025$87.79
8 Nov 2025$89.94
9 Nov 2025$89.94
10 Nov 2025$89.94
11 Nov 2025$89.94
12 Nov 2025$89.94
13 Nov 2025$89.94
14 Nov 2025$89.94
15 Nov 2025$93.69
16 Nov 2025$93.69
17 Nov 2025$93.69
18 Nov 2025$97.45
19 Nov 2025$97.45
20 Nov 2025$97.45
21 Nov 2025$97.45
22 Nov 2025$97.45
23 Nov 2025$97.45
24 Nov 2025$97.45
25 Nov 2025$97.45
26 Nov 2025$97.45
27 Nov 2025$97.45
28 Nov 2025$98.81
29 Nov 2025$100.35
30 Nov 2025$100.35
1 Dec 2025$100.35
2 Dec 2025$100.35
3 Dec 2025$100.35
4 Dec 2025$100.35
5 Dec 2025$100.35
6 Dec 2025$100.35
7 Dec 2025$100.35
8 Dec 2025$100.35
9 Dec 2025$100.35
10 Dec 2025$100.35
11 Dec 2025$100.35
12 Dec 2025$100.35
13 Dec 2025$100.35
14 Dec 2025$100.35
15 Dec 2025$102.33
16 Dec 2025$102.33
17 Dec 2025$102.33
18 Dec 2025$102.33
19 Dec 2025$102.99
20 Dec 2025$102.99
21 Dec 2025$102.99
22 Dec 2025$102.99
23 Dec 2025$102.99
24 Dec 2025$102.99
25 Dec 2025$102.99
26 Dec 2025$102.99
27 Dec 2025$102.99
28 Dec 2025$102.99
29 Dec 2025$102.99
30 Dec 2025$103.64
31 Dec 2025$103.64
1 Jan 2026$103.64
2 Jan 2026$103.64
3 Jan 2026$104.45
4 Jan 2026$104.45
5 Jan 2026$104.45
6 Jan 2026$104.45
7 Jan 2026$104.45
8 Jan 2026$104.45
9 Jan 2026$104.45
10 Jan 2026$104.45
11 Jan 2026$104.45
12 Jan 2026$104.45
13 Jan 2026$104.45
14 Jan 2026$104.45
15 Jan 2026$104.45
16 Jan 2026$104.45
17 Jan 2026$104.45
18 Jan 2026$104.45
19 Jan 2026$104.45
20 Jan 2026$105.35
21 Jan 2026$105.35
22 Jan 2026$105.35
23 Jan 2026$105.35
24 Jan 2026$105.35
25 Jan 2026$105.35
26 Jan 2026$105.35
27 Jan 2026$105.35
28 Jan 2026$105.35
29 Jan 2026$105.35
30 Jan 2026$105.35
31 Jan 2026$105.35
1 Feb 2026$105.35
3 Feb 2026$105.35
4 Feb 2026$105.35
5 Feb 2026$105.35
6 Feb 2026$105.35
7 Feb 2026$108.56
8 Feb 2026$108.56
9 Feb 2026$108.56
10 Feb 2026$108.56
11 Feb 2026$110.90
12 Feb 2026$110.90
13 Feb 2026$110.90
14 Feb 2026$113.12
15 Feb 2026$113.12
16 Feb 2026$113.12
17 Feb 2026$114.42
18 Feb 2026$114.42
19 Feb 2026$114.42
20 Feb 2026$114.42
21 Feb 2026$114.42
22 Feb 2026$114.42
23 Feb 2026$114.42
24 Feb 2026$114.42
25 Feb 2026$114.42
26 Feb 2026$114.42
27 Feb 2026$114.42
28 Feb 2026$114.42
1 Mar 2026$115.88
2 Mar 2026$115.88
3 Mar 2026$115.88
4 Mar 2026$116.42
5 Mar 2026$116.42
6 Mar 2026$116.42
7 Mar 2026$116.42
8 Mar 2026$116.42
9 Mar 2026$116.42
10 Mar 2026$116.42
11 Mar 2026$116.42
12 Mar 2026$116.42
13 Mar 2026$117.30
14 Mar 2026$117.30
15 Mar 2026$119.31
16 Mar 2026$119.31
17 Mar 2026$119.31
18 Mar 2026$119.31
19 Mar 2026$119.31
20 Mar 2026$118.71
21 Mar 2026$119.64
22 Mar 2026$119.64
23 Mar 2026$119.64
24 Mar 2026$119.64
25 Mar 2026$120.89
26 Mar 2026$120.89
27 Mar 2026$120.89
28 Mar 2026$120.89
29 Mar 2026$120.89
30 Mar 2026$120.89
31 Mar 2026$120.89
1 Apr 2026$120.89
2 Apr 2026$120.89
3 Apr 2026$120.89
4 Apr 2026$120.89
5 Apr 2026$120.89
6 Apr 2026$120.89
7 Apr 2026$120.89
8 Apr 2026$120.89
9 Apr 2026$120.89
10 Apr 2026$120.89
11 Apr 2026$120.89
12 Apr 2026$120.89
13 Apr 2026$120.89
14 Apr 2026$120.89
15 Apr 2026$123.88
16 Apr 2026$123.88
17 Apr 2026$123.88
18 Apr 2026$123.88
19 Apr 2026$127.87
20 Apr 2026$127.87
21 Apr 2026$127.87
22 Apr 2026$127.87
23 Apr 2026$127.87
24 Apr 2026$127.87
25 Apr 2026$127.87
26 Apr 2026$127.87
27 Apr 2026$127.87
28 Apr 2026$127.87
29 Apr 2026$127.87
30 Apr 2026$127.87
1 May 2026$132.21
2 May 2026$132.21
3 May 2026$132.21
4 May 2026$132.21
5 May 2026$132.21
6 May 2026$132.21
7 May 2026$132.21
8 May 2026$132.97
9 May 2026$132.97
10 May 2026$132.97
11 May 2026$132.97
12 May 2026$132.97
13 May 2026$132.97
14 May 2026$131.84
15 May 2026$131.84
16 May 2026$131.84
17 May 2026$130.01
18 May 2026$130.01
19 May 2026$130.01
20 May 2026$130.01
21 May 2026$130.01
22 May 2026$130.01
23 May 2026$130.01
24 May 2026$130.01
25 May 2026$131.27
26 May 2026$131.27
27 May 2026$131.27
28 May 2026$131.93
29 May 2026$130.83
30 May 2026$131.85
31 May 2026$131.85
1 Jun 2026$131.85
2 Jun 2026$131.85
3 Jun 2026$131.85
4 Jun 2026$131.85
5 Jun 2026$131.85
6 Jun 2026$131.85
7 Jun 2026$131.85
8 Jun 2026$131.85
9 Jun 2026$131.85
10 Jun 2026$131.85
11 Jun 2026$131.85
12 Jun 2026$131.85
13 Jun 2026$131.27
14 Jun 2026$131.27
15 Jun 2026$131.27
16 Jun 2026$131.27
17 Jun 2026$131.27
18 Jun 2026$131.27
19 Jun 2026$131.27
20 Jun 2026$131.27
21 Jun 2026$131.27
22 Jun 2026$131.27
23 Jun 2026$131.27
24 Jun 2026$131.27
25 Jun 2026$131.27
26 Jun 2026$131.27
27 Jun 2026$131.27
28 Jun 2026$131.27
29 Jun 2026$131.27
30 Jun 2026$131.27
1 Jul 2026$131.27
2 Jul 2026$131.27
3 Jul 2026$131.27
4 Jul 2026$131.27
5 Jul 2026$131.27
6 Jul 2026$131.27
7 Jul 2026$131.27
8 Jul 2026$131.27
9 Jul 2026$131.27
10 Jul 2026$131.27
11 Jul 2026$131.27
12 Jul 2026$131.27
13 Jul 2026$131.27
14 Jul 2026$131.27
15 Jul 2026$131.27
16 Jul 2026$131.27
17 Jul 2026$131.27
18 Jul 2026$131.27
19 Jul 2026$131.27
20 Jul 2026$131.27
21 Jul 2026$131.27
22 Jul 2026$131.27
23 Jul 2026$131.27
24 Jul 2026$131.27
25 Jul 2026$131.27
26 Jul 2026$131.27
27 Jul 2026$131.27
28 Jul 2026$131.27
29 Jul 2026$131.27
30 Jul 2026$131.27
31 Jul 2026$131.27
1 Aug 2026$131.27
2 Aug 2026$131.27
3 Aug 2026$131.27
4 Aug 2026$131.27
5 Aug 2026$131.27
6 Aug 2026$131.27
7 Aug 2026$130.77
8 Aug 2026$130.77
9 Aug 2026$130.77
10 Aug 2026$130.77
11 Aug 2026$130.53
12 Aug 2026$130.53
13 Aug 2026$130.53
14 Aug 2026$130.53
15 Aug 2026$130.53
16 Aug 2026$130.53
17 Aug 2026$130.53
18 Aug 2026$130.53
19 Aug 2026$130.53
20 Aug 2026$130.53
21 Aug 2026$130.53
22 Aug 2026$130.53
23 Aug 2026$130.53
24 Aug 2026$130.53
25 Aug 2026$130.53
26 Aug 2026$130.53
27 Aug 2026$130.53
28 Aug 2026$130.53
29 Aug 2026$130.53
30 Aug 2026$130.53
31 Aug 2026$135.35
1 Sept 2026$135.35
2 Sept 2026$135.35
3 Sept 2026$135.35
4 Sept 2026$135.35
5 Sept 2026$135.35
6 Sept 2026$135.35
7 Sept 2026$135.35
8 Sept 2026$135.35
9 Sept 2026$135.58
10 Sept 2026$135.58
11 Sept 2026$135.58
12 Sept 2026$136.94
13 Sept 2026$136.94
14 Sept 2026$136.94
15 Sept 2026$136.94
17 Sept 2026$136.26
20 Sept 2026$135.92
23 Sept 2026$135.92
26 Sept 2026$135.92
29 Sept 2026$135.92
2 Oct 2026$132.84
5 Oct 2026$132.84
8 Oct 2026$132.84
15 Oct 2026$126.67
16 Oct 2026$126.67
17 Oct 2026$126.67
20 Oct 2026$126.67
21 Oct 2026$126.67
23 Oct 2026$126.67
Period high$136.94
Period low$43.09
Period average$88.65
Recorded points725

Sales History

1 sold · all variants(30D)

Sales recorded · 18 Sept 2026 – 17 Oct 2026. Sales are grouped into reporting periods; the final date is the latest available data.

Showing Cold Foil - Near Mint - English

Click a bar to view full breakdown
View recorded sales data
Reporting periods for Cold Foil - Near Mint - English. Missing values are shown as a dash.
DateUnits soldTransactionsMarket priceDetails
20/09/202600$135.92View sales
23/09/202600$135.92View sales
26/09/202600$135.92View sales
29/09/202600$135.92View sales
02/10/202611$132.84View sales
05/10/202600$132.84View sales
08/10/202600$132.84View sales
11/10/202600$132.84View sales
14/10/202600$132.84View sales
17/10/202600$132.84View sales
1Units sold · selected condition
1Transactions · selected condition
$134.07Average recorded market price
$98.90Lowest Sale
$98.90Highest Sale

Average recorded market price is the simple mean of reporting periods with a positive market price; it is not weighted by sales volume. A dash means no usable observation is available.