Reading ASCII file with header and varying data after certain number of rows

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Saurabh Srivastava
Saurabh Srivastava on 22 Feb 2021
I have data file (actually sinex file) containg header information, along with data. The arrange of data is not uniform and after certain number of row, the type of data changes, hereby, I am giving the example.
Header
%=SNX 2.02 TUG 19:312:35135 TUG 18:152:00000 18:182:00000 C 09405 2
*-------------------------------------------------------------------------------
+FILE/REFERENCE
*INFO_TYPE_________ INFO________________________________________________________
DESCRIPTION ITSG-Grace2018_n96_2018-06
SOFTWARE GROOPS
-FILE/REFERENCE
*-------------------------------------------------------------------------------
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First data (after 26 lines)
1 CN 2 -- 0 18:167:00000 ---- 2 -4.84169464779211e-04 9.7270e-12
2 CN 2 -- 1 18:167:00000 ---- 2 -4.54239237731450e-10 2.7769e-12
3 SN 2 -- 1 18:167:00000 ---- 2 1.52983517542445e-09 3.0415e-12
4 CN 2 -- 2 18:167:00000 ---- 2 2.43936657466591e-06 3.1010e-12
5 SN 2 -- 2 18:167:00000 ---- 2 -1.40036290147627e-06 3.0824e-12
6 CN 3 -- 0 18:167:00000 ---- 2 9.57223650838727e-07 3.3689e-12
7 CN 3 -- 1 18:167:00000 ---- 2 2.03042471558275e-06 2.4091e-12
8 SN 3 -- 1 18:167:00000 ---- 2 2.48301840776579e-07 2.3248e-12
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Second Data
1 CN 2 -- 0 18:167:00000 ---- 2 1.93972990977242e+12
2 CN 2 -- 1 18:167:00000 ---- 2 5.66224330188529e+12
3 SN 2 -- 1 18:167:00000 ---- 2 5.25237345945381e+12
4 CN 2 -- 2 18:167:00000 ---- 2 -1.73307223111545e+12
5 SN 2 -- 2 18:167:00000 ---- 2 -2.47741310043326e+12
6 CN 3 -- 0 18:167:00000 ---- 2 6.96651880065224e+12
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Third data
1 1 1.15121953185884e+22 1.73756987650400e+21 1.82664373341362e+21
1 4 2.82091597898258e+20 6.06931037084952e+20 -3.07400660603768e+21
1 7 2.21340757149702e+21 1.29058517138195e+21 -1.40888189248258e+21
1 10 -2.51195122034479e+20 -1.87524380123726e+21 1.29288971441302e+21
1 13 -5.72747220888352e+21 -1.68518038400174e+21 -2.56648638333165e+21
1 16 -1.77641267364111e+21 -1.49516972421175e+21 -4.88156149198581e+20
1 19 1.22807465476043e+21 -1.11183731653828e+21 2.67786200389881e+21
1 22 7.89398501965380e+20 -3.69350123138616e+20 2.17375377264516e+20
1 25 1.77090598508143e+21 1.03491787517118e+21 9.97545222832784e+20
1 28 -3.20917334939508e+21 -8.25444495424586e+20 2.46243865543457e+21
1 31 8.10978934743248e+20 1.58991150980513e+21 6.97216232171431e+21
1 34 8.97042334816089e+19 -1.60618421056701e+21 -1.52151216236228e+20
1 37 7.80855689662903e+20 1.31818508545320e+21 -2.58680097565409e+21
1 40 -9.97123589742701e+20 -2.13200206969835e+21 1.10949422285466e+21
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All these data are in one file. Can anyone suggest me how to read the data?

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