NGC 2541 Table A6: Photometry for the PC Secondary Standards X Y RA(J2000) Dec(J2000) F555W F814W V I 93.72 148.16 8:14:41.89 49:01:52.4 25.71 0.03 24.09 0.03 25.71 24.05 107.60 105.66 8:14:42.03 49:01:50.9 25.63 0.02 23.59 0.02 25.65 23.55 174.50 79.58 8:14:41.98 49:01:47.7 25.47 0.02 23.78 0.03 25.47 23.74 181.66 475.99 8:14:40.38 49:01:56.3 26.35 0.04 25.11 0.05 26.34 25.07 272.00 469.11 8:14:40.20 49:01:52.6 25.44 0.02 25.12 0.05 25.42 25.10 274.51 227.33 8:14:41.16 49:01:47.1 25.64 0.02 24.29 0.03 25.63 24.24 278.64 394.70 8:14:40.48 49:01:50.7 25.74 0.02 25.49 0.06 25.73 25.47 284.47 639.85 8:14:39.49 49:01:56.0 25.22 0.02 23.01 0.02 25.26 22.99 410.12 426.81 8:14:40.05 49:01:46.2 25.29 0.02 24.60 0.04 25.28 24.57 439.49 332.96 8:14:40.36 49:01:42.9 26.69 0.05 26.21 0.26 26.68 26.18 450.43 175.37 8:14:40.97 49:01:39.0 26.29 0.04 25.86 0.08 26.28 25.84 463.95 587.41 8:14:39.29 49:01:47.7 25.20 0.02 24.82 0.04 25.19 24.79 485.50 754.73 8:14:38.57 49:01:50.6 25.57 0.03 24.02 0.02 25.57 23.98 502.97 427.83 8:14:39.84 49:01:42.6 25.64 0.02 25.49 0.07 25.63 25.48 528.58 76.95 8:14:41.18 49:01:33.7 26.01 0.03 25.83 0.14 26.00 25.82 539.43 492.97 8:14:39.49 49:01:42.6 25.54 0.02 25.37 0.07 25.53 25.35 549.40 744.21 8:14:38.47 49:01:47.9 24.98 0.02 23.40 0.02 24.98 23.36 594.72 262.68 8:14:40.29 49:01:35.2 25.88 0.03 24.26 0.03 25.88 24.22 609.81 637.40 8:14:38.75 49:01:43.1 25.13 0.02 24.92 0.04 25.13 24.90 615.42 702.39 8:14:38.48 49:01:44.3 25.55 0.02 25.71 0.08 25.56 25.72 715.48 129.18 8:14:40.55 49:01:27.5 24.89 0.02 24.86 0.05 24.89 24.86 723.56 332.43 8:14:39.72 49:01:31.7 25.67 0.02 25.52 0.08 25.66 25.51 762.40 480.53 8:14:39.03 49:01:33.6 25.01 0.02 24.79 0.04 25.00 24.77 778.91 655.28 8:14:38.30 49:01:36.9 25.85 0.03 25.89 0.12 25.85 25.90 The X and Y coordinate are relative to the 1995 October 30 epoch. For each 800x800 pixels chip, pixel [1,1] is located at the edge of the WFPC2 pyramid. RA and Dec are calculated using the IRAF task STSDAS.HST_CALIB.WFPC.METRIC, version 1.3.5 (July 1996). F555W and F814W instrumental magnitudes are intensity averaged over 13 and 5 epochs respectively. V and I magnitudes are calculated from the instrumental F555W and F814W magnitudes as described in Section 3. Photometry for the WF2 Secondary Standards X Y RA(J2000) Dec(J2000) F555W F814W V I 63.06 270.53 8:14:43.49 49:02:14.2 24.22 0.01 24.16 0.03 24.22 24.16 70.41 749.62 8:14:45.77 49:02:56.0 24.54 0.01 24.14 0.03 24.52 24.11 74.74 784.64 8:14:45.90 49:02:59.2 25.51 0.02 25.39 0.07 25.51 25.38 84.72 478.62 8:14:44.33 49:02:33.2 25.26 0.02 23.75 0.03 25.26 23.71 92.47 146.89 8:14:42.62 49:02:04.9 25.28 0.02 25.20 0.06 25.28 25.19 109.09 252.53 8:14:43.00 49:02:14.8 25.74 0.03 25.65 0.07 25.74 25.65 120.57 139.48 8:14:42.34 49:02:05.6 25.02 0.02 24.53 0.04 25.00 24.50 121.19 298.54 8:14:43.12 49:02:19.4 25.44 0.02 24.55 0.04 25.43 24.51 137.44 668.47 8:14:44.79 49:02:52.2 25.23 0.02 25.03 0.05 25.22 25.02 140.15 399.40 8:14:43.45 49:02:29.0 23.42 0.01 23.09 0.02 23.41 23.07 174.25 510.80 8:14:43.70 49:02:40.4 25.18 0.02 25.14 0.05 25.18 25.13 189.75 497.35 8:14:43.50 49:02:40.0 25.26 0.02 25.08 0.05 25.25 25.06 247.19 114.67 8:14:41.10 49:02:09.6 25.18 0.02 25.04 0.05 25.17 25.03 248.64 78.69 8:14:40.91 49:02:06.5 25.69 0.03 24.17 0.02 25.68 24.12 248.77 766.62 8:14:44.30 49:03:06.1 25.53 0.03 23.78 0.03 25.53 23.74 280.82 627.28 8:14:43.34 49:02:55.6 25.11 0.02 24.96 0.05 25.11 24.95 354.57 550.27 8:14:42.31 49:02:52.6 24.73 0.02 24.10 0.03 24.71 24.07 355.46 538.66 8:14:42.24 49:02:51.6 24.81 0.02 24.83 0.05 24.81 24.83 409.65 57.17 8:14:39.39 49:02:12.5 25.82 0.03 25.77 0.09 25.81 25.76 450.51 157.46 8:14:39.52 49:02:23.1 25.49 0.02 25.36 0.06 25.49 25.35 458.49 256.92 8:14:39.94 49:02:32.1 24.87 0.02 25.04 0.04 24.88 25.06 487.66 563.51 8:14:41.20 49:03:00.2 25.19 0.02 24.79 0.05 25.18 24.77 557.55 581.89 8:14:40.67 49:03:05.1 25.24 0.02 25.10 0.06 25.24 25.09 567.64 632.88 8:14:40.83 49:03:10.0 24.96 0.02 24.60 0.03 24.95 24.58 584.62 410.63 8:14:39.59 49:02:51.6 22.93 0.01 21.10 0.01 22.93 21.06 599.65 294.05 8:14:38.88 49:02:42.2 25.00 0.02 25.09 0.05 25.01 25.09 605.55 290.18 8:14:38.81 49:02:42.1 24.73 0.02 24.76 0.04 24.73 24.76 607.14 261.29 8:14:38.65 49:02:39.7 25.48 0.02 25.23 0.06 25.47 25.22 621.52 313.34 8:14:38.78 49:02:44.9 25.09 0.02 24.86 0.04 25.08 24.84 Photometry for the WF3 Secondary Standards X Y RA(J2000) Dec(J2000) F555W F814W V I 61.89 508.53 8:14:46.60 49:01:32.3 25.60 0.03 24.23 0.03 25.59 24.19 77.23 369.25 8:14:45.46 49:01:40.4 25.65 0.03 25.32 0.06 25.64 25.30 116.81 680.74 8:14:48.38 49:01:28.6 25.18 0.02 25.28 0.06 25.18 25.29 123.62 281.23 8:14:44.91 49:01:48.7 25.65 0.03 23.97 0.02 25.65 23.93 139.25 95.32 8:14:43.37 49:01:59.1 25.70 0.03 25.90 0.11 25.71 25.91 162.15 188.38 8:14:44.29 49:01:56.5 24.82 0.02 24.22 0.03 24.80 24.19 180.54 632.60 8:14:48.28 49:01:36.4 25.98 0.03 25.48 0.06 25.96 25.45 209.09 360.71 8:14:46.03 49:01:52.1 25.26 0.02 25.20 0.06 25.26 25.19 222.31 93.31 8:14:43.76 49:02:06.4 23.26 0.01 23.01 0.03 23.25 23.00 246.48 115.09 8:14:44.07 49:02:07.4 24.49 0.02 22.04 0.01 24.54 22.03 279.43 102.34 8:14:44.12 49:02:10.9 25.13 0.02 24.93 0.05 25.12 24.91 307.57 564.42 8:14:48.32 49:01:50.7 24.21 0.01 22.18 0.01 24.24 22.14 414.19 710.44 8:14:50.13 49:01:52.8 23.92 0.01 22.10 0.01 23.92 22.06 425.46 688.52 8:14:49.99 49:01:54.8 25.62 0.02 25.58 0.07 25.61 25.58 433.48 705.46 8:14:50.18 49:01:54.7 24.76 0.02 23.09 0.02 24.76 23.05 436.23 77.69 8:14:44.69 49:02:25.6 24.97 0.02 24.94 0.05 24.97 24.93 447.86 751.14 8:14:50.65 49:01:53.7 25.38 0.02 23.94 0.02 25.38 23.89 467.57 76.80 8:14:44.83 49:02:28.4 25.55 0.02 25.24 0.06 25.54 25.22 471.26 611.66 8:14:49.55 49:02:02.5 25.81 0.03 25.83 0.08 25.81 25.84 490.36 725.33 8:14:50.63 49:01:58.6 25.31 0.02 25.30 0.05 25.31 25.30 490.52 678.03 8:14:50.22 49:02:00.9 25.45 0.02 25.32 0.06 25.45 25.31 494.98 720.64 8:14:50.62 49:01:59.3 25.84 0.03 24.45 0.03 25.83 24.40 498.46 244.11 8:14:46.45 49:02:22.9 25.75 0.03 25.67 0.07 25.74 25.66 540.88 623.54 8:14:50.00 49:02:08.0 26.01 0.03 24.57 0.03 26.00 24.53 554.65 548.80 8:14:49.41 49:02:12.8 25.32 0.02 24.91 0.04 25.31 24.88 568.60 479.24 8:14:48.87 49:02:17.4 25.65 0.03 25.64 0.07 25.65 25.64 616.28 418.59 8:14:48.58 49:02:24.5 25.70 0.03 24.15 0.03 25.70 24.10 619.28 455.07 8:14:48.91 49:02:23.0 25.24 0.02 25.26 0.06 25.25 25.26 637.72 716.68 8:14:51.29 49:02:11.8 24.84 0.01 25.01 0.04 24.85 25.02 640.36 760.61 8:14:51.68 49:02:09.8 24.94 0.02 24.29 0.03 24.92 24.26 685.61 129.80 8:14:46.39 49:02:44.5 25.92 0.03 25.41 0.08 25.91 25.38 710.44 106.44 8:14:46.31 49:02:47.8 25.50 0.02 25.45 0.07 25.50 25.44 Photometry for the WF4 Secondary Standards X Y RA(J2000) Dec(J2000) F555W F814W V I 84.10 389.18 8:14:41.01 49:01:20.9 25.81 0.03 25.52 0.07 25.80 25.50 86.01 590.40 8:14:40.02 49:01:03.5 25.76 0.03 25.70 0.08 25.76 25.69 105.91 486.49 8:14:40.71 49:01:11.4 25.15 0.02 23.57 0.02 25.14 23.53 151.28 168.81 8:14:42.72 49:01:36.5 24.59 0.01 24.05 0.03 24.58 24.02 201.37 488.42 8:14:41.53 49:01:06.5 24.97 0.02 24.80 0.03 24.96 24.79 265.35 522.09 8:14:41.92 49:01:00.4 25.43 0.02 25.39 0.05 25.43 25.38 298.38 604.80 8:14:41.79 49:00:51.7 25.20 0.02 23.41 0.02 25.20 23.37 331.40 559.56 8:14:42.31 49:00:53.9 25.99 0.03 25.68 0.08 25.98 25.66 376.42 212.30 8:14:44.46 49:01:21.7 23.43 0.01 21.16 0.01 23.46 21.14 376.92 336.78 8:14:43.84 49:01:10.8 25.79 0.03 25.77 0.08 25.79 25.77 394.02 234.25 8:14:44.51 49:01:18.8 24.99 0.02 25.03 0.05 24.99 25.03 435.40 383.21 8:14:44.11 49:01:03.9 25.99 0.03 25.46 0.08 25.97 25.43 483.26 263.20 8:14:45.14 49:01:11.9 24.64 0.01 24.48 0.03 24.63 24.47 524.12 617.98 8:14:43.70 49:00:39.3 24.49 0.01 24.52 0.03 24.49 24.52 534.90 491.20 8:14:44.43 49:00:49.6 24.16 0.01 24.24 0.03 24.16 24.24 600.83 476.76 8:14:45.08 49:00:47.6 24.37 0.01 22.67 0.01 24.37 22.63 604.54 333.50 8:14:45.84 49:00:59.7 26.09 0.03 23.92 0.02 26.12 23.89 623.85 364.25 8:14:45.85 49:00:56.1 25.61 0.02 24.18 0.02 25.60 24.13 629.49 649.46 8:14:44.45 49:00:31.4 25.22 0.02 24.92 0.04 25.21 24.91 642.32 153.43 8:14:47.08 49:01:13.3 25.43 0.02 25.11 0.05 25.42 25.09 670.62 215.83 8:14:47.01 49:01:06.6 25.00 0.02 24.49 0.03 24.98 24.46 675.74 721.70 8:14:44.49 49:00:23.0 25.93 0.03 25.78 0.08 25.92 25.77 713.34 144.41 8:14:47.74 49:01:10.6 25.79 0.03 25.68 0.08 25.79 25.67 717.34 457.58 8:14:46.19 49:00:43.5 24.90 0.02 23.27 0.02 24.90 23.23 728.40 437.18 8:14:46.40 49:00:44.7 24.61 0.01 23.74 0.02 24.59 23.70 730.48 588.67 8:14:45.64 49:00:31.6 24.80 0.01 24.73 0.04 24.80 24.73 733.43 447.63 8:14:46.38 49:00:43.5 24.73 0.01 24.58 0.04 24.72 24.57 735.67 278.51 8:14:47.26 49:00:58.0 24.71 0.01 24.73 0.04 24.71 24.74 761.48 491.30 8:14:46.40 49:00:38.4 25.75 0.03 24.40 0.03 25.74 24.35