feature(helioviewer): add documentation about sources to the script and update the readme
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# helioviewer_grab
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Kleines Skript, das ein Sonnen-Vollscheibenbild von [Helioviewer](https://helioviewer.org)
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zu einem gewünschten Zeitpunkt herunterlädt.
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Small script that downloads a full-disk sun image from
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[Helioviewer](https://helioviewer.org) for a given point in time.
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Es sucht in der Helioviewer-API die Datenquelle passend zum angegebenen
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Stichwort (z.B. `hmi_continuum`), holt das dem Zeitpunkt am nächsten liegende
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Bild und speichert es als PNG im aktuellen Verzeichnis.
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It looks up the Helioviewer API for the data source matching the given
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keyword (e.g. `hmi_continuum`), fetches the image closest to the requested
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time, and saves it as a PNG in the current directory.
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## Nutzung
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## Usage
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```bash
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./helioviewer_grab.py 2026-08-12T18:18:00Z hmi_continuum
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./helioviewer_grab.py --list # verfügbare Datenquellen anzeigen
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./helioviewer_grab.py --list # show all available data sources
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./helioviewer_grab.py --sources # short explanation of the most useful ones
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```
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Ohne Argumente werden Beispielwerte verwendet (siehe Docstring im Skript).
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Without arguments, example values are used (see the docstring in the script).
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`--sources` prints a curated, human-readable description for the most
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commonly used sources (AIA wavelengths, HMI, GONG H-alpha), what each one
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shows and roughly how detailed it is. For full-disk imaging, SDO/HMI
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(0.5"/px) and SDO/AIA (0.6"/px) offer the highest resolution among the
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continuously available sources.
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Here's a list of all available sources:
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```yaml
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0 SOHO/EIT/171 EIT 171
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1 SOHO/EIT/195 EIT 195
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2 SOHO/EIT/284 EIT 284
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3 SOHO/EIT/304 EIT 304
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4 SOHO/LASCO/C2/white-light LASCO C2
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5 SOHO/LASCO/C3/white-light LASCO C3
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6 SOHO/MDI/magnetogram MDI Mag
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7 SOHO/MDI/continuum MDI Int
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8 SDO/AIA/94 AIA 94
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9 SDO/AIA/131 AIA 131
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10 SDO/AIA/171 AIA 171
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11 SDO/AIA/193 AIA 193
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12 SDO/AIA/211 AIA 211
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13 SDO/AIA/304 AIA 304
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14 SDO/AIA/335 AIA 335
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15 SDO/AIA/1600 AIA 1600
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16 SDO/AIA/1700 AIA 1700
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17 SDO/AIA/4500 AIA 4500
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18 SDO/HMI/continuum HMI Int
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19 SDO/HMI/magnetogram HMI Mag
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20 STEREO_A/SECCHI/EUVI/171 EUVI-A 171
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21 STEREO_A/SECCHI/EUVI/195 EUVI-A 195
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22 STEREO_A/SECCHI/EUVI/284 EUVI-A 284
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23 STEREO_A/SECCHI/EUVI/304 EUVI-A 304
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24 STEREO_B/SECCHI/EUVI/171 EUVI-B 171
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25 STEREO_B/SECCHI/EUVI/195 EUVI-B 195
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26 STEREO_B/SECCHI/EUVI/284 EUVI-B 284
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27 STEREO_B/SECCHI/EUVI/304 EUVI-B 304
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28 STEREO_A/SECCHI/COR1/white-light COR1-A
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29 STEREO_A/SECCHI/COR2/white-light COR2-A
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30 STEREO_B/SECCHI/COR1/white-light COR1-B
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31 STEREO_B/SECCHI/COR2/white-light COR2-B
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32 PROBA2/SWAP/174 SWAP 174
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33 Yohkoh/SXT/AlMgMn SXT AlMgMn
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34 Yohkoh/SXT/thin-Al SXT thin-Al
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35 Yohkoh/SXT/white-light SXT white-light
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39 Hinode/XRT/Al_med/Al_thick XRT Al_med/Al_thick
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40 Hinode/XRT/Al_med/Be_thick XRT Al_med/Be_thick
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42 Hinode/XRT/Al_med/Open XRT Al_med/Open
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43 Hinode/XRT/Al_med/Ti_poly XRT Al_med/Ti_poly
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44 Hinode/XRT/Al_poly/Al_mesh XRT Al_poly/Al_mesh
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45 Hinode/XRT/Al_poly/Al_thick XRT Al_poly/Al_thick
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46 Hinode/XRT/Al_poly/Be_thick XRT Al_poly/Be_thick
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48 Hinode/XRT/Al_poly/Open XRT Al_poly/Open
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49 Hinode/XRT/Al_poly/Ti_poly XRT Al_poly/Ti_poly
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54 Hinode/XRT/Be_med/Open XRT Be_med/Open
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60 Hinode/XRT/Be_thin/Open XRT Be_thin/Open
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62 Hinode/XRT/C_poly/Al_mesh XRT C_poly/Al_mesh
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63 Hinode/XRT/C_poly/Al_thick XRT C_poly/Al_thick
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66 Hinode/XRT/C_poly/Open XRT C_poly/Open
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67 Hinode/XRT/C_poly/Ti_poly XRT C_poly/Ti_poly
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69 Hinode/XRT/Open/Al_mesh XRT Open/Al_mesh
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70 Hinode/XRT/Open/Al_thick XRT Open/Al_thick
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71 Hinode/XRT/Open/Be_thick XRT Open/Be_thick
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74 Hinode/XRT/Open/Ti_poly XRT Open/Ti_poly
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75 TRACE/171 TRACE 171
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76 TRACE/195 TRACE 195
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77 TRACE/284 TRACE 284
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78 TRACE/1216 TRACE 1216
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79 TRACE/1550 TRACE 1550
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80 TRACE/1600 TRACE 1600
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81 TRACE/1700 TRACE 1700
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82 TRACE/white-light TRACE white-light
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83 MLSO/COSMO/KCor/735 COSMO KCor
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84 SOLO/EUI/FSI/174 EUI FSI 174
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85 SOLO/EUI/FSI/304 EUI FSI 304
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86 SOLO/EUI/HRI/174 EUI HRI 174
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87 SOLO/EUI/HRI/1216 EUI HRI 1216
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88 IRIS/SJI/1330 IRIS SJI 1330
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89 IRIS/SJI/2796 IRIS SJI 2796
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90 IRIS/SJI/1400 IRIS SJI 1400
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92 IRIS/SJI/2832 IRIS SJI 2832
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94 GONG/GONG/H-alpha/6562 GONG H-alpha
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95 RHESSI/3-6keV/Back Projection RHESSI
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96 RHESSI/6-12keV/Back Projection RHESSI
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97 RHESSI/12-25keV/Back Projection RHESSI
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98 RHESSI/25-50keV/Back Projection RHESSI
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99 RHESSI/50-100keV/Back Projection RHESSI
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100 RHESSI/100-300keV/Back Projection RHESSI
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101 RHESSI/3-6keV/Clean RHESSI
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102 RHESSI/6-12keV/Clean RHESSI
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103 RHESSI/12-25keV/Clean RHESSI
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104 RHESSI/25-50keV/Clean RHESSI
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105 RHESSI/50-100keV/Clean RHESSI
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106 RHESSI/100-300keV/Clean RHESSI
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107 RHESSI/3-6keV/Clean 59 RHESSI
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108 RHESSI/6-12keV/Clean 59 RHESSI
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109 RHESSI/12-25keV/Clean 59 RHESSI
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110 RHESSI/25-50keV/Clean 59 RHESSI
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111 RHESSI/50-100keV/Clean 59 RHESSI
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112 RHESSI/100-300keV/Clean 59 RHESSI
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113 RHESSI/3-6keV/MEM GE RHESSI
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114 RHESSI/6-12keV/MEM GE RHESSI
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115 RHESSI/12-25keV/MEM GE RHESSI
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116 RHESSI/25-50keV/MEM GE RHESSI
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117 RHESSI/50-100keV/MEM GE RHESSI
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118 RHESSI/100-300keV/MEM GE RHESSI
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119 RHESSI/3-6keV/VIS CS RHESSI
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120 RHESSI/6-12keV/VIS CS RHESSI
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121 RHESSI/12-25keV/VIS CS RHESSI
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122 RHESSI/25-50keV/VIS CS RHESSI
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123 RHESSI/50-100keV/VIS CS RHESSI
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124 RHESSI/100-300keV/VIS CS RHESSI
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125 RHESSI/3-6keV/VIS FWDFIT RHESSI
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126 RHESSI/6-12keV/VIS FWDFIT RHESSI
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127 RHESSI/12-25keV/VIS FWDFIT RHESSI
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128 RHESSI/25-50keV/VIS FWDFIT RHESSI
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129 RHESSI/50-100keV/VIS FWDFIT RHESSI
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130 RHESSI/100-300keV/VIS FWDFIT RHESSI
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131 PUNCH/WFI+NFI/Total Brightness PUNCH
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132 GOES/CCOR-1/CCOR-1/white-light GOES CCOR-1
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134 PUNCH/WFI+NFI/Polarized Brightness PUNCH
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2000 GOES/SUVI/94 SUVI 94
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2001 GOES/SUVI/131 SUVI 131
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2002 GOES/SUVI/171 SUVI 171
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2003 GOES/SUVI/195 SUVI 195
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2004 GOES/SUVI/284 SUVI 284
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2005 GOES/SUVI/304 SUVI 304
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10001 Hinode/XRT/Any/Any XRT Any/Any
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10002 Hinode/XRT/Any/Al_mesh XRT Any/Al_mesh
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10003 Hinode/XRT/Any/Al_thick XRT Any/Al_thick
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10004 Hinode/XRT/Any/Be_thick XRT Any/Be_thick
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10005 Hinode/XRT/Any/Gband XRT Any/Gband
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10006 Hinode/XRT/Any/Open XRT Any/Open
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10007 Hinode/XRT/Any/Ti_poly XRT Any/Ti_poly
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10008 Hinode/XRT/Al_med/Any XRT Al_med/Any
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10009 Hinode/XRT/Al_poly/Any XRT Al_poly/Any
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10010 Hinode/XRT/Be_med/Any XRT Be_med/Any
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10011 Hinode/XRT/Be_thin/Any XRT Be_thin/Any
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10012 Hinode/XRT/C_poly/Any XRT C_poly/Any
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10013 Hinode/XRT/Open/Any XRT Open/Any
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```
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## Requirements
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Nur die Python-Standardbibliothek, keine Dependencies.
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Mit [devenv](https://devenv.sh) steht der passende Interpreter direkt bereit:
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Only the Python standard library, no dependencies.
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With [devenv](https://devenv.sh), the right interpreter is available right away:
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```bash
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devenv shell
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