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diff --git a/fg21sim/uvsim/ska1low.layout.txt b/fg21sim/uvsim/ska1low.layout.txt
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+#
+# SKA1-low configurations
+#
+# * Core: area 1000 m in diameter, within which the individual stations
+#   are randomly located with no overlap
+# * Central: area 1700 m in radius
+# * Cluster: a group of 6 stations placed randomly around a cluster
+#   location, only defined for stations outside the core area
+# * Individual stations will be 35-45 m in diameter
+# * Each station has 256 antenna elements randomly placed
+# * Total 512 stations; total 131,072 antenna elements
+# * 3 arms with each arm of the spiral will contain 16 clusters
+# * WGS84 Positions of SKA1-low Stations
+#
+# Note:
+# WGS84 is an Earth-centred, Earth-fixed terrestrial reference system
+# and geodetic datum
+#
+# Reference:
+# SKA-TEL-SKO-0000422, revision 02, 2016-05-31, Table 1
+# http://astronomers.skatelescope.org/wp-content/uploads/2016/09/SKA-TEL-SKO-0000422_02_SKA1_LowConfigurationCoordinates-1.pdf
+#
+# Array center: 116.7644482 , -26.82472208
+#
+Label	Longitude	Latitude
+CENTER	116.7644482	-26.82472208
+C1	116.7655399	-26.82598212
+C2	116.7639199	-26.82400458
+C3	116.7651234	-26.82519844
+C4	116.7632707	-26.8251632
+C5	116.7647362	-26.82463766
+C6	116.7642597	-26.82325862
+C7	116.7642824	-26.82416999
+C8	116.76438	-26.82506289
+C9	116.7654336	-26.82419534
+C10	116.7631211	-26.82429413
+C11	116.7635745	-26.82428184
+C12	116.7658808	-26.82362068
+C13	116.7644358	-26.8255531
+C14	116.7647771	-26.82533563
+C15	116.764054	-26.82459854
+C16	116.7626123	-26.82468757
+C17	116.7648029	-26.82399616
+C18	116.7658352	-26.82414453
+C19	116.7640291	-26.82512808
+C20	116.7649085	-26.82491591
+C21	116.76592	-26.82458807
+C22	116.7661627	-26.82516717
+C23	116.7651635	-26.82559726
+C24	116.7640078	-26.82355978
+C25	116.7654027	-26.82351788
+C26	116.763623	-26.82333348
+C27	116.7645438	-26.82367721
+C28	116.7647061	-26.82617453
+C29	116.7639855	-26.82568058
+C30	116.7650723	-26.82371812
+C31	116.7654382	-26.82539298
+C32	116.7650863	-26.82320406
+C33	116.7638584	-26.82607063
+C34	116.7662326	-26.82416669
+C35	116.7636826	-26.825313
+C36	116.7631402	-26.8256788
+C37	116.7651604	-26.82466117
+C38	116.7633534	-26.82474063
+C39	116.7651052	-26.82620429
+C40	116.7626254	-26.82423371
+C41	116.7636904	-26.82458619
+C42	116.7663276	-26.82449107
+C43	116.7625929	-26.82524526
+C44	116.7649674	-26.82438176
+C45	116.7638367	-26.82640251
+C46	116.7628656	-26.8238663
+C47	116.7659002	-26.82575495
+C48	116.7628386	-26.8249453
+C49	116.7645657	-26.82298227
+C50	116.7662168	-26.82557408
+C51	116.7647726	-26.82341861
+C52	116.7642471	-26.82596996
+C53	116.7633445	-26.8238249
+C54	116.7655102	-26.82451286
+C55	116.7664459	-26.8248581
+C56	116.7629456	-26.8254135
+C57	116.7648417	-26.82577849
+C58	116.7635399	-26.82582645
+C59	116.7644183	-26.82448199
+C60	116.7656886	-26.82504806
+C61	116.7631797	-26.82605715
+C62	116.7634832	-26.82624136
+C63	116.763684	-26.82495975
+C64	116.7632454	-26.82340203
+C65	116.7639195	-26.82303146
+C66	116.7643659	-26.82645226
+C67	116.762996	-26.82465271
+C68	116.7654434	-26.82316337
+C69	116.7655698	-26.82382532
+C70	116.7642254	-26.82381443
+C71	116.7658689	-26.82541509
+C72	116.7661605	-26.82381893
+C73	116.7648361	-26.82648871
+C74	116.762772	-26.82568999
+C75	116.7653454	-26.82494098
+C76	116.7663944	-26.82617565
+C77	116.7664468	-26.82650837
+C78	116.7625601	-26.82260188
+C79	116.7657815	-26.82657439
+C80	116.7616289	-26.82384839
+C81	116.7652462	-26.82734339
+C82	116.7631213	-26.82666532
+C83	116.7672825	-26.82346752
+C84	116.7627999	-26.82644619
+C85	116.7664591	-26.82314495
+C86	116.7635966	-26.82688522
+C87	116.7621415	-26.8254654
+C88	116.764998	-26.82695038
+C89	116.7629746	-26.82285708
+C90	116.7615335	-26.82422313
+C91	116.7627927	-26.82686624
+C92	116.7617537	-26.82455842
+C93	116.7632495	-26.82217299
+C94	116.7672552	-26.82585337
+C95	116.7621609	-26.82416921
+C96	116.761874	-26.82327722
+C97	116.7653964	-26.82272323
+C98	116.7671022	-26.82427994
+C99	116.7656369	-26.82703905
+C100	116.7656085	-26.82629731
+C101	116.763807	-26.82221824
+C102	116.7634192	-26.82276293
+C103	116.7668948	-26.82564607
+C104	116.7661372	-26.82255359
+C105	116.7640186	-26.82263542
+C106	116.7621211	-26.82296638
+C107	116.7668842	-26.82385968
+C108	116.7622668	-26.82505449
+C109	116.7658279	-26.82239906
+C110	116.7649912	-26.82236118
+C111	116.7626226	-26.82598492
+C112	116.7645539	-26.82694785
+C113	116.7633663	-26.82718924
+C114	116.7622453	-26.82341098
+C115	116.7616692	-26.82577828
+C116	116.7628237	-26.82354014
+C117	116.7660285	-26.82622295
+C118	116.7642422	-26.82201412
+C119	116.7667019	-26.82340513
+C120	116.7665894	-26.82535037
+C121	116.7621203	-26.82373723
+C122	116.7645773	-26.82234715
+C123	116.7662301	-26.82342668
+C124	116.7672749	-26.82481892
+C125	116.7624309	-26.82653613
+C126	116.766926	-26.82617013
+C127	116.7620173	-26.82651026
+C128	116.7622932	-26.82623597
+C129	116.7617214	-26.82541223
+C130	116.7640445	-26.82718983
+C131	116.7667126	-26.82415317
+C132	116.7661493	-26.82672156
+C133	116.7668224	-26.82295559
+C134	116.7653755	-26.82224409
+C135	116.7616432	-26.82507543
+C136	116.7675196	-26.82533617
+C137	116.7626337	-26.82301075
+C138	116.7647103	-26.82190813
+C139	116.7631223	-26.82255216
+C140	116.7622778	-26.8258963
+C141	116.7668197	-26.82653546
+C142	116.7642399	-26.82680215
+C143	116.7661542	-26.82704072
+C144	116.7674227	-26.82443615
+C145	116.7666547	-26.82590629
+C146	116.7661875	-26.82288295
+C147	116.7669636	-26.82463374
+C148	116.7644075	-26.82266232
+C149	116.7664854	-26.82271089
+C150	116.7665177	-26.82374226
+C151	116.7613343	-26.82451061
+C152	116.7612312	-26.82550191
+C153	116.7686378	-26.82529022
+C154	116.7605929	-26.82579734
+C155	116.7650951	-26.82117971
+C156	116.7653222	-26.8280368
+C157	116.7627565	-26.82784591
+C158	116.764037	-26.82792142
+C159	116.7683599	-26.82601356
+C160	116.7609995	-26.82640912
+C161	116.7640259	-26.82096612
+C162	116.7618694	-26.8227134
+C163	116.7676604	-26.82675263
+C164	116.7665496	-26.82770799
+C165	116.7686127	-26.82458774
+C166	116.7653518	-26.82141498
+C167	116.7659312	-26.82734683
+C168	116.7610827	-26.82372739
+C169	116.7677769	-26.82592112
+C170	116.7609614	-26.82337974
+C171	116.7661936	-26.82755908
+C172	116.7658204	-26.82776267
+C173	116.7645573	-26.82851292
+C174	116.767146	-26.8269159
+C175	116.7627073	-26.82148846
+C176	116.7613301	-26.82291113
+C177	116.7634317	-26.82799351
+C178	116.7611987	-26.82487698
+C179	116.7644733	-26.82135602
+C180	116.7677047	-26.8235112
+C181	116.7677574	-26.82414156
+C182	116.7613807	-26.82344169
+C183	116.766763	-26.82156738
+C184	116.7623196	-26.82792623
+C185	116.7618808	-26.82684172
+C186	116.7611495	-26.82416534
+C187	116.7678962	-26.82551428
+C188	116.7682371	-26.82470261
+C189	116.7680438	-26.8233971
+C190	116.7685012	-26.8241408
+C191	116.7648745	-26.82773344
+C192	116.7614764	-26.82718221
+C193	116.7637109	-26.82115804
+C194	116.7622888	-26.82736392
+C195	116.7665419	-26.8218194
+C196	116.7670628	-26.82233543
+C197	116.7645424	-26.82761733
+C198	116.7682532	-26.82523962
+C199	116.7610607	-26.82257748
+C200	116.766963	-26.82528073
+C201	116.7634067	-26.82842181
+C202	116.7637098	-26.827613
+C203	116.760337	-26.8246924
+C204	116.7652939	-26.8283618
+C205	116.7608787	-26.82458576
+C206	116.7653751	-26.82768902
+C207	116.7659601	-26.82093591
+C208	116.7655451	-26.82080717
+C209	116.7660134	-26.82141401
+C210	116.765662	-26.8215957
+C211	116.7656703	-26.82117011
+C212	116.7663145	-26.82120899
+C213	116.7600867	-26.82541986
+C214	116.7607958	-26.82543758
+C215	116.7602056	-26.82500971
+C216	116.7600324	-26.8258537
+C217	116.7597561	-26.8256036
+C218	116.7605133	-26.82521484
+C219	116.767651	-26.8278177
+C220	116.7672891	-26.82765479
+C221	116.7673298	-26.82721763
+C222	116.766967	-26.82782358
+C223	116.7675715	-26.82745917
+C224	116.7668773	-26.82748782
+E1-1	116.7627663	-26.82017705
+E1-2	116.7624285	-26.81991547
+E1-3	116.7627393	-26.81976351
+E1-4	116.7621333	-26.81972558
+E1-5	116.7629951	-26.81950173
+E1-6	116.7624133	-26.81922925
+E2-1	116.7575812	-26.82106002
+E2-2	116.7571411	-26.82075518
+E2-3	116.7582742	-26.82063137
+E2-4	116.7576853	-26.82062054
+E2-5	116.7572467	-26.82034479
+E2-6	116.7579644	-26.82030267
+E3-1	116.7530506	-26.82574525
+E3-2	116.7534118	-26.8257181
+E3-3	116.7525791	-26.82539971
+E3-4	116.7533349	-26.82533874
+E3-5	116.7529682	-26.82530981
+E3-6	116.7530614	-26.82497726
+E4-1	116.7520466	-26.83431587
+E4-2	116.7524497	-26.83423445
+E4-3	116.7524928	-26.83386187
+E4-4	116.7528935	-26.8337915
+E4-5	116.7519148	-26.83370172
+E4-6	116.7522365	-26.83333486
+N1-1	116.7601497	-26.82900989
+N1-2	116.7606991	-26.82898023
+N1-3	116.7610568	-26.82891341
+N1-4	116.7604849	-26.8287265
+N1-5	116.7608437	-26.82863455
+N1-6	116.7602443	-26.82831962
+N2-1	116.7642049	-26.8323567
+N2-2	116.7634234	-26.8323525
+N2-3	116.7637745	-26.83221191
+N2-4	116.7634227	-26.83203244
+N2-5	116.7641982	-26.83189926
+N2-6	116.763739	-26.83178841
+N3-1	116.771122	-26.83354856
+N3-2	116.7707261	-26.83354453
+N3-3	116.7702908	-26.83336839
+N3-4	116.7708843	-26.83325587
+N3-5	116.770381	-26.83298091
+N3-6	116.7709195	-26.83279833
+N4-1	116.7793212	-26.83009728
+N4-2	116.7791814	-26.82979154
+N4-3	116.7795292	-26.82971812
+N4-4	116.7788501	-26.82946553
+N4-5	116.7795128	-26.82936374
+N4-6	116.7791201	-26.82908633
+S1-1	116.7703631	-26.82615138
+S1-2	116.7699892	-26.82591782
+S1-3	116.7696118	-26.82585567
+S1-4	116.7703549	-26.82583525
+S1-5	116.7700985	-26.82545142
+S1-6	116.7704838	-26.82537765
+S2-1	116.772083	-26.82189476
+S2-2	116.7714744	-26.82176823
+S2-3	116.7718145	-26.82163965
+S2-4	116.7712388	-26.82140139
+S2-5	116.7721587	-26.82131996
+S2-6	116.7718594	-26.82104472
+S3-1	116.769971	-26.81601882
+S3-2	116.7696285	-26.81562856
+S3-3	116.7690852	-26.81555426
+S3-4	116.7701158	-26.81550478
+S3-5	116.7692767	-26.81523649
+S3-6	116.7697275	-26.81514361
+S4-1	116.7618649	-26.81117181
+S4-2	116.7613392	-26.81110183
+S4-3	116.7621652	-26.81092563
+S4-4	116.7616863	-26.81074688
+S4-5	116.7618862	-26.8104525
+S4-6	116.7613224	-26.81043869
+E5-1	116.7587488	-26.84394699
+E5-2	116.7593113	-26.84366272
+E5-3	116.758716	-26.84360499
+E5-4	116.7582899	-26.84348559
+E5-5	116.7590691	-26.84327509
+E5-6	116.7587759	-26.84296827
+E6-1	116.7717769	-26.84975404
+E6-2	116.7721822	-26.84962038
+E6-3	116.7717076	-26.8492535
+E6-4	116.7723117	-26.84915399
+E6-5	116.7713075	-26.84908174
+E6-6	116.7720743	-26.8488616
+E7-1	116.7906677	-26.84866896
+E7-2	116.7910262	-26.84854895
+E7-3	116.7903222	-26.84848215
+E7-4	116.7913485	-26.84839303
+E7-5	116.7906526	-26.84806248
+E7-6	116.7910011	-26.84790263
+E8-1	116.8116745	-26.8363453
+E8-2	116.8121999	-26.83616165
+E8-3	116.8112332	-26.8360942
+E8-4	116.8120439	-26.83577632
+E8-5	116.8116774	-26.83574934
+E8-6	116.8111896	-26.83568571
+E9-1	116.8261115	-26.81023238
+E9-2	116.8264827	-26.80995352
+E9-3	116.826081	-26.8097928
+E9-4	116.8267997	-26.80959316
+E9-5	116.826478	-26.80945514
+E9-6	116.8260119	-26.80945385
+S5-1	116.7491272	-26.81152597
+S5-2	116.7490547	-26.81109842
+S5-3	116.7496873	-26.81091406
+S5-4	116.7486614	-26.81087983
+S5-5	116.7492924	-26.81082273
+S5-6	116.7488724	-26.8105963
+S6-1	116.7369384	-26.81849759
+S6-2	116.7374566	-26.81848799
+S6-3	116.7372028	-26.81825846
+S6-4	116.7376329	-26.81799621
+S6-5	116.7367779	-26.81796736
+S6-6	116.7372458	-26.8178076
+S7-1	116.7286485	-26.83374709
+S7-2	116.7281764	-26.83347982
+S7-3	116.7290074	-26.83342162
+S7-4	116.7286519	-26.8332142
+S7-5	116.7288959	-26.8329414
+S7-6	116.728237	-26.83288695
+S8-1	116.7296735	-26.8560953
+S8-2	116.7300576	-26.8560741
+S8-3	116.7304059	-26.85574847
+S8-4	116.7300923	-26.85559479
+S8-5	116.7297105	-26.85548493
+S8-6	116.7300099	-26.8551816
+S9-1	116.7478812	-26.88073626
+S9-2	116.7473977	-26.88057617
+S9-3	116.7478699	-26.88033877
+S9-4	116.7473076	-26.88021958
+S9-5	116.7483166	-26.88001382
+S9-6	116.7475354	-26.87992913
+N5-1	116.7851002	-26.82014855
+N5-2	116.7855278	-26.82006489
+N5-3	116.7848767	-26.81983794
+N5-4	116.7852767	-26.81970067
+N5-5	116.785792	-26.81951644
+N5-6	116.785225	-26.8193791
+N6-1	116.7843351	-26.8070545
+N6-2	116.784902	-26.80703233
+N6-3	116.7845194	-26.80677593
+N6-4	116.7841326	-26.80675068
+N6-5	116.7849203	-26.80671248
+N6-6	116.7845937	-26.80636045
+N7-1	116.7739721	-26.79281135
+N7-2	116.7735765	-26.792698
+N7-3	116.7743154	-26.79269621
+N7-4	116.7745857	-26.79247191
+N7-5	116.7742106	-26.79234492
+N7-6	116.7738522	-26.792231
+N8-1	116.7515433	-26.78285983
+N8-2	116.752285	-26.78263646
+N8-3	116.7513539	-26.78258462
+N8-4	116.7517881	-26.7824441
+N8-5	116.7514499	-26.78225374
+N8-6	116.7520839	-26.78213682
+N9-1	116.7193487	-26.78450672
+N9-2	116.7196165	-26.78423906
+N9-3	116.7188221	-26.78418602
+N9-4	116.71924	-26.78408511
+N9-5	116.7194779	-26.78376003
+N9-6	116.718931	-26.78372956
+E10-1	116.8347371	-26.86176268
+E10-2	116.834348	-26.86159647
+E10-3	116.8353121	-26.8615534
+E10-4	116.8347631	-26.86125593
+E10-5	116.8344672	-26.86094903
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